configure.ac

dnl +------------------------------------------------------------------+
dnl | Network UPS Tools: configure.ac                                  |
dnl +------------------------------------------------------------------+

dnl # Support for older autoconf without m4_esyscmd_s
m4_ifndef([m4_chomp_all], [m4_define([m4_chomp_all], [m4_format([[%.*s]], m4_bregexp(m4_translit([[$1]], [/], [/ ]), [/*$]), [$1])])])
m4_ifndef([m4_esyscmd_s], [m4_define([m4_esyscmd_s], [m4_chomp_all(m4_esyscmd([$1]))])])

dnl NUT version number is defined here, with a Git suffixed macro like
dnl    NUT_VERSION_MACRO "2.7.4-2838+gdfc3ac08"
dnl defined separately in include/nut_version.h (generated by make)
dnl ...or not defined, for quicker rebuilds, depending on settings.
dnl Old hard-coded approach (mangled a bit):
dnl AC INIT([nut],[2.8.2.1],[https://github.com/networkupstools/nut/issues])
dnl Note: srcdir is only set after AC INIT has completed, but $0 points
dnl to the generated configure script which is part of dist tarball and
dnl should be at source root too.
dnl Note: this gets evaluated (script called) a lot of times during autoconf
dnl but ends up as static strings in the generated configure script. It may
dnl be beneficial to have a `version.m4` generated by `autogen.sh` and/or
dnl shipped in a tarball, allowing for a singular include into configure.ac
dnl See https://github.com/networkupstools/nut/issues/1949 for details.
dnl Oddly, autoconf-2.69 on CentOS 7 both complains that AC INIT argument
dnl is not a literal, and does contain expected values in the generated
dnl script and include/config.h. A "pure" m4 solution would be quieter.
AC_INIT([nut],
    m4_esyscmd_s([NUT_VERSION_QUERY=VER50 "`dirname \"$0\"`/tools/gitlog2version.sh" 2>/dev/null]),
    [https://github.com/networkupstools/nut/issues],[nut],
    m4_esyscmd_s([NUT_VERSION_QUERY=URL "`dirname \"$0\"`/tools/gitlog2version.sh" 2>/dev/null]))
dnl See docs/maintainer-guide.txt about releases - updating the version
dnl above is a small part of the consistent ritual!

dnl Detect usable grep and egrep as soon as possible, to let called scripts
dnl use them. Unfortunately, init must happen before macros that output text,
dnl so the first call above misses out on the detected values.
AC_PROG_EGREP
export GREP
export EGREP

dnl PACKAGE_URL="https://www.networkupstools.org/" for development iterations
dnl or "https://www.networkupstools.org/historic/v1.2.3/index.html" for release
dnl snapshots further set in stone. Either way, there should be a slash and
dnl either a filename, or nothing. Adding a bogus filename and chopping it
dnl off by `dirname` should do the trick.
dnl NOTE: the resulting NUT_WEBSITE_BASE string does not end with a slash!
NUT_WEBSITE_BASE="`dirname \"${PACKAGE_URL}index.html\"`"
dnl Fallback, no trailing slash!
test -n "${NUT_WEBSITE_BASE-}" || NUT_WEBSITE_BASE='https://www.networkupstools.org'

dnl Note: this refers to GITREV at the time of configure script running
dnl primarily for better messaging in the script itself (also to render
dnl the PDF documentation revision history via docs/docinfo.xml.in).
dnl If the NUT codebase in this workspace is being developed and rebuilt
dnl without reconfiguration, detailed version in the binaries will differ
dnl (that one comes from the NUT_VERSION_MACRO from nut_version.h file).
dnl # Example:   NUT_SOURCE_GITREV='2.8.2.695.1-696+g0e00f0777'
NUT_SOURCE_GITREV="`NUT_VERSION_QUERY=DESC50 \"${srcdir}/tools/gitlog2version.sh\" 2>/dev/null`"

dnl A true/false (literally) response that can be used for prettier messages
dnl emitted by NUT code, or make some "auto" configuration choices below.
NUT_SOURCE_GITREV_IS_RELEASE="`NUT_VERSION_QUERY=IS_RELEASE \"${srcdir}/tools/gitlog2version.sh\" 2>/dev/null || echo false`"
NUT_SOURCE_GITREV_IS_PRERELEASE="`NUT_VERSION_QUERY=IS_PRERELEASE \"${srcdir}/tools/gitlog2version.sh\" 2>/dev/null || echo false`"

AS_IF([$NUT_SOURCE_GITREV_IS_RELEASE], [NUT_SOURCE_GITREV_DEVREL="release"], [
    AS_IF([$NUT_SOURCE_GITREV_IS_PRERELEASE], [NUT_SOURCE_GITREV_DEVREL="pre-release"],
        [NUT_SOURCE_GITREV_DEVREL="development iteration"])
])

dnl Semantic version of most-recent NUT release this code is derived from.
dnl It may equal the NUT_SOURCE_GITREV and NUT_SOURCE_GITREV_NUMERIC, but
dnl this situation is only expected if NUT_SOURCE_GITREV_IS_RELEASE==true;
dnl for a pre-release it may differ from even the base NUT_VERSION numbers
dnl (e.g. a commit tagged as 2.8.3-rc5 can have its own NUT_VERSION based
dnl on 2.8.2-something, but is assumed as a pre-release for 2.8.3 SEMVER).
NUT_SOURCE_GITREV_SEMVER="`NUT_VERSION_QUERY=SEMVER \"${srcdir}/tools/gitlog2version.sh\" 2>/dev/null`"
NUT_SOURCE_GITREV_SEMVER_COLONS="`echo \"${NUT_SOURCE_GITREV_SEMVER}\" | tr '.' ':'`"
NUT_SOURCE_GITREV_SEMVER_UNDERSCORES="`echo \"${NUT_SOURCE_GITREV_SEMVER}\" | tr '.' '_'`"

dnl Gitrev-based build identifier which can be used for e.g. PyPI uploads:
dnl # Example:   NUT_SOURCE_GITREV_NUMERIC='2.8.2.695.1.696'
dnl #   NUT_SOURCE_GITREV_NUMERIC="`echo \"${NUT_SOURCE_GITREV}\" | sed -e 's/^v//' -e 's/@<:@+-@:>@g.*$//' -e 's/-/./g'`"
dnl # Without the commit-count since tag (dash-separated part):
dnl # Example:   NUT_SOURCE_GITREV_NUMERIC='2.8.2.695.1'
NUT_SOURCE_GITREV_NUMERIC="`echo \"${NUT_SOURCE_GITREV}\" | sed -e 's/^v//' -e 's/@<:@+-@:>@g.*$//' -e 's/-@<:@0-9@:>@*$//'`"
NUT_SOURCE_GITREV_NUMERIC_COLONS="`echo \"${NUT_SOURCE_GITREV_NUMERIC}\" | tr '.' ':'`"
NUT_SOURCE_GITREV_NUMERIC_UNDERSCORES="`echo \"${NUT_SOURCE_GITREV_NUMERIC}\" | tr '.' '_'`"

dnl Note: except for experiments, do not pass this into config.h - use
dnl the NUT_VERSION_MACRO from nut_version.h instead. Developers may
dnl want to disable their "force-nut-version-header" configure option
dnl to reduce rebuild scope and so speed up the iterations with ccache.
dnl New "config.h" contents for every reconfig would defeat that purpose!
dnl ### AS_IF([test -n "${NUT_SOURCE_GITREV-}"],
dnl ###     [AC_DEFINE_UNQUOTED([NUT_SOURCE_GITREV], ["${NUT_SOURCE_GITREV}"], [NUT source revision when the build was configured])],
dnl ###     [AC_DEFINE([NUT_SOURCE_GITREV], [NULL], [NUT source revision when the build was configured: not detected])])

dnl Keep track of command-line options passed to this script:
AC_MSG_CHECKING([for CONFIG_FLAGS])
CONFIG_FLAGS=""
dnl Keep each token quoted, in case spaces or other special chars crawl in:
_flag_enable_inplace_runtime=""
for F in "$@" ; do
    case "$F" in
    *=*" "*) NF="$(echo "$F" | sed "s,=,=',")""'" && F="$NF" ;;
    esac

    case "$F" in
    --disable-inplace-runtime|--enable-inplace-runtime=no) _flag_enable_inplace_runtime="no" ;;
    --enable-inplace-runtime*) _flag_enable_inplace_runtime="$F" ;;
    *)
        test -z "${CONFIG_FLAGS}" \
        && CONFIG_FLAGS="$F" \
        || CONFIG_FLAGS="${CONFIG_FLAGS} $F"
        ;;
    esac
done
dnl Keep it "known" that we tried to re-use at least some local configuration
dnl so unspecified options are not necessarily at default values for this script
AS_IF([test x"${NUT_VERSION_DEPLOYED-}" = x"<reenter>"], [_flag_enable_inplace_runtime="reenter"])
F=""
AS_IF([test x"${NUT_VERSION_DEPLOYED-}" != x && test x"${NUT_VERSION_DEPLOYED-}" != x"<reenter>"], [
     dnl Even if explicitly disabled... did we re-enter? Save the value to be seen:
     F="--enable-inplace-runtime='${NUT_VERSION_DEPLOYED}'"
    ],[
     AS_CASE(["${_flag_enable_inplace_runtime}"],
        [no|""|reenter], [],
        [F="${_flag_enable_inplace_runtime}"])
    ])
AS_IF([test x"$F" != x], [
    test -z "${CONFIG_FLAGS}" \
    && CONFIG_FLAGS="$F" \
    || CONFIG_FLAGS="${CONFIG_FLAGS} $F"
    ])
unset _flag_enable_inplace_runtime
unset F
unset NF
AC_MSG_RESULT([${CONFIG_FLAGS}])

AC_DEFINE_UNQUOTED([CONFIG_FLAGS],["${CONFIG_FLAGS}"],[Flags passed to configure script])
AC_SUBST(CONFIG_FLAGS)

AC_CHECK_PROGS([MKTEMP], [mktemp], [])
AS_IF([test x"${MKTEMP}" = x], [
dnl # Have a simple (unsafe, unfeatured) fallback implementation:
mktemp() {
    if test x"$1" = x"-d" ; then
        shift
        mkdir -p "$1.$$" || return
    else
        cat /dev/null > "$1.$$" || return
    fi
    echo "$1.$$"
}
MKTEMP=mktemp
])

AC_CONFIG_AUX_DIR([.])
AC_CONFIG_SRCDIR(server/upsd.c)
AC_CONFIG_MACRO_DIR([m4])

NUT_SOURCE_VERSION_REPORT="Network UPS Tools version ${PACKAGE_VERSION}"
AS_IF([test x"${NUT_SOURCE_GITREV}" != x],
    [AS_IF([test x"${NUT_SOURCE_GITREV}" = x"${PACKAGE_VERSION}"],
        [NUT_SOURCE_VERSION_REPORT="Network UPS Tools version ${PACKAGE_VERSION} ${NUT_SOURCE_GITREV_DEVREL}"],
        [NUT_SOURCE_VERSION_REPORT="Network UPS Tools version ${PACKAGE_VERSION} (${NUT_SOURCE_GITREV}) ${NUT_SOURCE_GITREV_DEVREL}"])
    ])
echo "${NUT_SOURCE_VERSION_REPORT}"

AC_CANONICAL_TARGET
NUT_CHECK_OS

NUT_ARG_ENABLE([configure-debug],
    [Request that this run of the configure script reports more details about values it discovered, primarily for developer troubleshooting],
    [no])

dnl Further below we shuffle variants of these values possibly stripped of
dnl warnings or with added further values. Here we save the most-original copy
dnl so it can be passed e.g. to "make distcheck" the way the caller intended.
NUT_CONFIG_CFLAGS=""
NUT_CONFIG_CPPFLAGS=""
NUT_CONFIG_CXXFLAGS=""
NUT_CONFIG_LDFLAGS=""
AS_IF([test -n "${CFLAGS-}"   -a x"${CFLAGS-}"   != x" "],
	[NUT_CONFIG_CFLAGS="${CFLAGS-}"])
AS_IF([test -n "${CXXFLAGS-}" -a x"${CXXFLAGS-}" != x" "],
	[NUT_CONFIG_CXXFLAGS="${CXXFLAGS-}"])
AS_IF([test -n "${CPPFLAGS-}" -a x"${CPPFLAGS-}" != x" "],
	[NUT_CONFIG_CPPFLAGS="${CPPFLAGS-}"])
AS_IF([test -n "${LDFLAGS-}"  -a x"${LDFLAGS-}"  != x" "],
	[NUT_CONFIG_LDFLAGS="${LDFLAGS-}"])
AC_SUBST([NUT_CONFIG_CFLAGS])
AC_SUBST([NUT_CONFIG_CXXFLAGS])
AC_SUBST([NUT_CONFIG_CPPFLAGS])
AC_SUBST([NUT_CONFIG_LDFLAGS])

NUT_STASH_WARNINGS
AC_CONFIG_HEADERS([include/config.h])
AC_PREFIX_DEFAULT(/usr/local/ups)
AM_INIT_AUTOMAKE([subdir-objects tar-pax])

AS_CASE([${target_os}],
	[*mingw*], [AS_CASE([${CFLAGS-}${CXXFLAGS-}],
		[*"-std=c"*|*-ansi*], [
			AC_MSG_NOTICE(
[-----------------------------------------------------------------------
WARNING: It seems you are building with MinGW and requested a strict C/C++
language mode. Per https://stackoverflow.com/a/76780217/4715872 MinGW may
not define WIN32 and other options needed for proper building and linking.
If this happens, please retry with GNU C/C++ language mode options instead.
-----------------------------------------------------------------------])
			sleep 5
		])]
)

dnl AIX system
AM_CONDITIONAL([SYSTEM_AIX], [test "xAIX" = "x`uname -s 2>/dev/null`"])

dnl processor type
AC_DEFINE_UNQUOTED(CPU_TYPE, ["$target_cpu"], [Define processor type])

dnl +-------------------------------------------------------------------
dnl Help avoid "polluting" CFLAGS etc. with auto-settings like "-g -O2"
dnl at least if we intend to tune --with-debuginfo anyway (where we check
dnl if the caller asked for specific optimizations). Following some
dnl experimentation, we do not want to actually mangle the flags provided
dnl by autoconf - for GCC at least, the rightmost mentions of conflicting
dnl flags on command line win. We just want to know when it is okay to add
dnl ours. They may be inherited from "in-place" build setup though.
test -n "${CONFIG_CFLAGS-}"   || CONFIG_CFLAGS="${CFLAGS-}"
test -n "${CONFIG_CXXFLAGS-}" || CONFIG_CXXFLAGS="${CXXFLAGS-}"
test -n "${CONFIG_CPPFLAGS-}" || CONFIG_CPPFLAGS="${CPPFLAGS-}"
test -n "${CONFIG_LDFLAGS-}"  || CONFIG_LDFLAGS="${LDFLAGS-}"
AC_SUBST([CONFIG_CFLAGS])
AC_SUBST([CONFIG_CXXFLAGS])
AC_SUBST([CONFIG_CPPFLAGS])
AC_SUBST([CONFIG_LDFLAGS])
dnl +-------------------------------------------------------------------

dnl Default to `configure --enable-silent-rules` or `make V=1` for details?
dnl This feature seems to require automake-1.13 or newer (1.11+ by other info)
dnl On very old systems can comment it away with little loss (then automake-1.10
dnl is known to suffice):
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])],
	[AC_MSG_NOTICE([Silent Rules feature not defined in this automake version, skipped])])

dnl +-------------------------------------------------------------------
dnl we need Autoconf 2.61 or better to enable features of Posix that are extensions to C
dnl (and actually 2.64 or better for m4/ax_check_compile_flag.m4 when it is sourced)
dnl UPDATE: As tested on CentOS 6, its "autoconf-2.63-5.1.el6.noarch" also suffices.
dnl But OpenBSD 6.5 requires autoconf-2.65 and automake-1.13 or newer...
AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) CFLAGS_BEFORE_ACPROG="${CFLAGS-}"])
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) CXXFLAGS_BEFORE_ACPROG="${CXXFLAGS-}"])
])
AC_MSG_CHECKING(for autoconf macro to enable system extensions)
m4_version_prereq(2.61, [
	AC_MSG_RESULT(yes)
	dnl Causes calls to ac_prog stuff, so dittoed below if "no"
	AC_USE_SYSTEM_EXTENSIONS
], [
	AC_MSG_RESULT(no)
	AC_PROG_CC
])

AC_PREREQ([2.63])
dnl #AC_PREREQ([2.64])

dnl Macro AC_PROG_CC_C99 is obsolete; use AC_PROG_CC
dnl Note that NUT does not support building with C89 anyway
dnl AC_PROG_CC_C99
dnl Needed for per-target flags
AM_PROG_CC_C_O
AC_PROG_CPP
AC_PROG_CXX
AC_PROG_CXX_C_O
AC_PATH_PROG([LDD], [ldd])

CFLAGS_AFTER_ACPROG="${CFLAGS-}"
CXXFLAGS_AFTER_ACPROG="${CXXFLAGS-}"

AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) CFLAGS_AFTER_ACPROG="${CFLAGS-}"])
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) CXXFLAGS_AFTER_ACPROG="${CXXFLAGS-}"])
])

dnl # LEGACY DEFAULT FALLBACK which NUT had since 2005 or before:
dnl # if autoconf does not set any options, use default/moderate optimizations
CFLAGS=${CFLAGS-"-O"}
dnl # Not so far a legacy, added for consistency in 2024 :)
CXXFLAGS=${CXXFLAGS-"-O"}

dnl Check for various integer types
AC_TYPE_SSIZE_T
AC_TYPE_INTMAX_T
AC_TYPE_INT8_T
AC_TYPE_INT16_T
AC_TYPE_INT32_T
AC_TYPE_INT64_T

AC_TYPE_SIZE_T
AC_TYPE_UINTMAX_T
AC_TYPE_UINT8_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T

dnl +-------------------------------------------------------------------

dnl Use "./configure --enable-maintainer-mode" to keep Makefile.in and Makefile
dnl in sync after Git updates.
AM_MAINTAINER_MODE

dnl TOTHINK: Add a default --with-nutdir-suffix='nut'/'ups'/etc. for different paths we make?
NUT_ARG_WITH([confdir-suffix], [SHORT_DIRNAME], [Relative path to NUT configuration files under '${sysconfdir}', typically 'nut'], [auto])
NUT_ARG_WITH_EXPAND_DEFAULT_HELP_SINGLEQUOTE([confdir], [DIRPATH], [Complete path to NUT configuration files], [\${sysconfdir}\${confdir_suffix}])
NUT_ARG_WITH_EXPAND_DEFAULT_HELP_SINGLEQUOTE([confdir-examples], [DIRPATH], [Complete path to NUT configuration file examples (some like it under datadir)], [\${confdir}])

dnl ---------------------------------------------------------------------
dnl GNU and BSD make are okay with the syntax, but Sun make/dmake are not:
AC_MSG_CHECKING([whether this make implementation supports 'export VAR=VAL' syntax])
dnl # using printf formatting for some funniner shells out there
nut_am_output="`printf 'export VAR=VAL\ntest:\n\t@echo \"VAR=%s%sVAR%s\"\n' '\$' '(' ')' | ${MAKE-make} -f - test`"
nut_am_result="$?"
AS_IF([test x"${nut_am_result}" = x0 -a x"${nut_am_output}" = x"VAR=VAL"], [
	NUT_AM_MAKE_CAN_EXPORT=""
	AC_MSG_RESULT(yes)
], [
	NUT_AM_MAKE_CAN_EXPORT="#ThisMakeCanNotExport# "
	AC_MSG_RESULT(no: got '${nut_am_output}')
])
AC_SUBST(NUT_AM_MAKE_CAN_EXPORT)

dnl ---------------------------------------------------------------------
dnl Some versions of BSD make (e.g. in NetBSD 11) may require this syntax
dnl in lieu of the more standard "+" prefix, but at least GNU make exploded
dnl with it, so we can not use it everywhere:
AC_MSG_CHECKING([whether this make implementation supports a .MAKE special source (pseudo-goal for sub-makes)])
dnl # using printf formatting for some funniner shells out there
nut_am_output="`printf 'sub: .MAKE\n\t@printf \\\"test:\\\\n\\\\t@echo %s\\\\n\\\" | $(MAKE) -f - test\n' '\\\\\\\"Hello world\\\\\\\"' | ${MAKE-make} -f - sub`"
nut_am_result="$?"
AS_IF([test x"${nut_am_result}" = x0 -a x"${nut_am_output}" = x"Hello world"], [
	dotMAKE=".MAKE"
	AC_MSG_RESULT(yes)
], [
	dotMAKE=""
	AC_MSG_RESULT(no: got '${nut_am_output}')
])
AC_SUBST(dotMAKE)

dnl ---------------------------------------------------------------------
dnl Some systems have older autotools without direct macro support for PKG_CONF*
NUT_CHECK_PKGCONFIG

dnl ---------------------------------------------------------------------
dnl Nowadays both `tail -n +3` and `tail +3` work almost everywhere
dnl * CentOS7 tail can not do `tail +3` -- no such file
dnl * Classic Solaris tooling (even in Solaris 11) can not do `tail -n` -- no such option
AC_MSG_CHECKING([how to "tail" starting from Nth line])
dnl Requires autoconf 2.62 or newer; for even older systems consider
dnl an adapted implementation of the logic below. For more details see
dnl https://www.gnu.org/software/autoconf/manual/autoconf-2.68/html_node/Generic-Programs.html
TAIL_ARGS_FROM_NTH_LINE=""
ac_path_TAIL_found=""
AC_PATH_PROGS_FEATURE_CHECK([TAIL], [tail gtail],
	[_TAIL_OUT="`(echo \"1\"; echo \"2\"; echo \"3\"; echo \"4\"; echo \"5\"; echo \"6\"; echo \"7\") | $ac_path_TAIL +3`" || _TAIL_OUT=""
	 AS_IF([(test x"${_TAIL_OUT}" != x && echo "${_TAIL_OUT}" | ${GREP} 3 && echo "${_TAIL_OUT}" | ${GREP} 7) >/dev/null],
		[AS_IF([(echo "${_TAIL_OUT}" | ${GREP} 1 || echo "${_TAIL_OUT}" | ${GREP} 2) >/dev/null], [],
			[ac_path_TAIL_found=:
				 ac_cv_path_TAIL="${ac_path_TAIL}"])
		])
	 AS_IF([test x"${ac_path_TAIL_found}" != x:],
		[_TAIL_OUT="`(echo \"1\"; echo \"2\"; echo \"3\"; echo \"4\"; echo \"5\"; echo \"6\"; echo \"7\") | $ac_path_TAIL -n +3`" || _TAIL_OUT=""
		 AS_IF([(test x"${_TAIL_OUT}" != x && echo "${_TAIL_OUT}" | ${GREP} 3 && echo "${_TAIL_OUT}" | ${GREP} 7) >/dev/null],
			[AS_IF([(echo "${_TAIL_OUT}" | ${GREP} 1 || echo "${_TAIL_OUT}" | ${GREP} 2) >/dev/null], [],
				[ac_path_TAIL_found=:
				 ac_cv_path_TAIL="${ac_path_TAIL}"
				 TAIL_ARGS_FROM_NTH_LINE="-n"])
			])
		])
	], [AC_MSG_ERROR([could not find tail that supports starting a listing from Nth line])]
)
AC_MSG_RESULT([$ac_cv_path_TAIL $TAIL_ARGS_FROM_NTH_LINE +NUM_FIRST_LINE])
AC_SUBST([TAIL], [$ac_cv_path_TAIL])
AC_SUBST([TAIL_ARGS_FROM_NTH_LINE], [$TAIL_ARGS_FROM_NTH_LINE])

dnl Various version related processing
dnl ----------------------------------

dnl # the following is commented out, because the UPS_VERSION macro now
dnl # resides in include/nut_version.h, which is generated by Makefile.am,
dnl # rather than in include/config.h, which is generated by configure.  The
dnl # reason is that the SVN revision should be computed at compile time,
dnl # not configure time.
dnl AC_DEFINE_UNQUOTED(UPS_VERSION, "${PACKAGE_VERSION}", [NUT version])

dnl However, automatically define the tree version (mostly for AC_SUBST)
dnl FIXME: This just picks first 3 chars, assuming single-digit components
dnl  separated by a dot:
TREE_VERSION="`echo ${PACKAGE_VERSION} | awk '{ print substr($0,1,3) }'`"
AC_DEFINE_UNQUOTED(TREE_VERSION, "${TREE_VERSION}", [NUT tree version])

dnl Should not be necessary, since old servers have well-defined errors for
dnl unsupported commands:
NUT_NETVERSION="1.3"
AC_DEFINE_UNQUOTED(NUT_NETVERSION, "${NUT_NETVERSION}", [NUT network protocol version])


dnl ---------------------------------------------------------------------
dnl Fix this early so we can expand with eval later
test "${prefix}" = "NONE" && prefix="${ac_default_prefix}"
test "${exec_prefix}" = "NONE" && exec_prefix='${prefix}'

AS_CASE([x"${nut_with_confdir}"],
	[xyes], [AC_MSG_ERROR([--with-confdir should specify a path name or expansible expression])],
	[x/*|x?":\\"*|x?:/*|x*/*|x*'\'*], [
		AC_MSG_NOTICE([A non-trivial --with-confdir path was specified (${nut_with_confdir}); any --with-confdir-suffix (${nut_with_confdir_suffix}) or --sysconfdir (${sysconfdir}) values are disregarded])
	], [
		RESULT_COMMENT=""
		AC_MSG_CHECKING([confdir-suffix to use after sysconfdir (${sysconfdir})])
		AS_CASE([x"${nut_with_confdir_suffix}"],
			[xyes], [AC_MSG_ERROR([--with-confdir-suffix should specify a relative path name under sysconfdir='${sysconfdir}'])],
			[x'$'*], [RESULT_COMMENT="expandable expression"],
			[xauto|x], [
				dnl Use an empty suffix if either no prefix was specified
				dnl (so resolving into /usr/local/ups/etc makes sense),
				dnl or if a sysconfdir was specified (legacy build configs).
				dnl Otherwise de facto append "/nut" to "${sysconfdir}".
				AS_CASE([${CONFIG_FLAGS}],
					[*--sysconfdir=*], [nut_with_confdir_suffix=""; RESULT_COMMENT='sysconfdir was customized...'],
					[*--prefix=*], [nut_with_confdir_suffix='/${PACKAGE_NAME}'; RESULT_COMMENT='prefix was customized...'],
						[nut_with_confdir_suffix=""; RESULT_COMMENT='prefix was not customized...'])
			], [
				RESULT_COMMENT="normalized caller-provided suffix..."
				nut_with_confdir_suffix="`echo \"/${nut_with_confdir_suffix}\" | sed -e 's,^/*,/,' -e 's,/*$,,'`"
			]
		)
		AC_MSG_RESULT([${RESULT_COMMENT} '${nut_with_confdir_suffix}'])
	]
)

dnl For expansions later:
confdir='${nut_with_confdir}'
confdir_suffix='${nut_with_confdir_suffix}'
confdir_examples='${nut_with_confdir_examples}'

AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) prefix='${prefix}'])
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) sysconfdir='${sysconfdir}'])
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_confdir_suffix='${nut_with_confdir_suffix}'])
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_confdir='${nut_with_confdir}'])
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_confdir_examples='${nut_with_confdir_examples}'])
])

dnl Note: for practical and platform-independent use, see AX_REALPATH macro
AC_CHECK_PROGS([REALPATH], [realpath], [])

dnl FIXME: remove after dev-testing
dnl UNITTEST_AX_REALPATH
dnl exit

dnl NOTE: for definition of NUT_* autoconf macros, see m4/ directory
dnl and docs/macros.txt

dnl +------------------------------------------------------------------+
dnl | default values for things later on (can be overridden)           |

dnl Define m4var and shellvar from that:
m4_define([m4nut_DEFAULT_STATEPATH], [/var/state/ups])
STATEPATH="m4nut_DEFAULT_STATEPATH"

dnl Historically this refers to *system location* for PID files,
dnl and more specifically that for `upsmon` (running as `root`).
dnl
dnl Note that by default we directly use the path that commonly
dnl exists on a system (see the likes of `man filesystem` or
dnl `man hier` for the "public" structure of the directory hierarchy
dnl accepted in an OS distribution), while usage of sub-directories
dnl like `/var/run/nut/...` can be explicitly configured on systems
dnl where our packaging, init-scripts, tmpfiles manifests etc. can
dnl ensure that these locations would exist and be properly owned.
dnl
dnl See also ALTPIDPATH (defaulted to STATEPATH) setting below
dnl for the unprivileged daemons (`upsd`, drivers).
m4_define([m4nut_DEFAULT_PIDPATH], [/var/run])
PIDPATH="m4nut_DEFAULT_PIDPATH"
dnl Honour new FHS-3.0 recommendations if applied on the build
dnl system (but do still prefer '/var/run' if usable); see also
dnl https://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard :
AS_IF([test ! -d "${PIDPATH}" -o -h "${PIDPATH}" && test -d "/run" -a ! -h "/run"], [
	AC_MSG_NOTICE([This system seems to prefer '/run' over '${PIDPATH}': adjusting default PIDPATH])
	PIDPATH="/run"
])

AC_CHECK_PROGS([GETENT], [getent], [])
AC_CHECK_PROGS([ID], [id], [])

PROBE_OS_USER="false"
PROBE_OS_GROUP="false"
AS_IF([test x"${GETENT}" != x], [
	PROBE_OS_USER="${GETENT} passwd "
	PROBE_OS_GROUP="${GETENT} group "
	],[
	AS_IF([test x"${ID}" != x], [
		PROBE_OS_USER="${ID} -u "
		AS_IF([test -r "/etc/groups"], [
			dnl FIXME: For command prefix usage like used in this
			dnl  script, we might be better off defining a shell
			dnl  function and referring to it. Grep would catch
			dnl  also user names that have a group as secondary!
			PROBE_OS_GROUP="cat /etc/groups | ${GREP} -w "
			], [
			dnl This shows groups of a USER with specified name!
			dnl But to probe for cases where string names are
			dnl same (e.g. "nut" or "ups") this might be good
			dnl enough.
			PROBE_OS_GROUP="${ID} -g "
			])
		AC_MSG_WARN([Can not PROPERLY check existence of group accounts on this system, but can try best-effort])
		],[
		AC_MSG_WARN([Can not check existence of user and group accounts on this system])
		])
	]
)

dnl Defaults for respective configure options below
dnl Note these defaults may change further below depending on OS and
dnl certain other configure options (e.g. "in-place replacement")
RUN_AS_USER="nobody"
RUN_AS_GROUP="nobody"
AS_IF([test -n "`${PROBE_OS_GROUP} nogroup`" && test -z "`${PROBE_OS_GROUP} \"${RUN_AS_GROUP}\"`"],
	[RUN_AS_GROUP="nogroup"]
)

dnl Last hit wins, user and groups accounts separately
for TOKEN in upsmon nutmon ups nut; do
	AS_IF([test -n "`${PROBE_OS_USER} ${TOKEN}`"], [RUN_AS_USER="${TOKEN}"])
	AS_IF([test -n "`${PROBE_OS_GROUP} ${TOKEN}`"], [RUN_AS_GROUP="${TOKEN}"])
done
unset TOKEN

dnl NOTE: NUT legacy default, keep as is for least surprise
dnl Distributions are however welcome to specify the option to use tmpfs
AS_CASE([${target_os}],
	[*mingw*], [POWERDOWNFLAG="C:\\\\killpower"], dnl NOTE: Double backslashes (times escaping) are correct!
	[POWERDOWNFLAG="/etc/killpower"] dnl POSIX systems default
)


m4_define([m4nut_DEFAULT_CGIEXECPATH], [\${exec_prefix}/cgi-bin])
m4_define([m4nut_DEFAULT_CGIDATAPATH], [\${prefix}/html])
m4_define([m4nut_DEFAULT_DRVPATH], [\${exec_prefix}/bin])
dnl Note: CGIDATAPATH (nee htmlcgidir) is for nut-cgi resources,
dnl so htmldocdir and htmlmandir are separate
htmldocdir='${docdir}/html-doc'
htmlmandir='${docdir}/html-man'
m4_define([m4nut_DEFAULT_PKGCONFIGDIR], [\${libdir}/pkgconfig])

dnl Detection of augeas lens dirs is a bit troublesome, since
dnl they (if present) reside in location not controlled by NUT.
dnl Try detecting based on build parameters, or fall back to
dnl hard-coded default location (may break e.g. distcheck).
dnl Note it would not work too well for "/usr/local/ups" :)
auglensdir='${datarootdir}/augeas/lenses/dist'
conftemp="${auglensdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"

if test ! -d "${conftemp}"; then
    auglensdir='${datarootdir}/augeas/lenses'
    conftemp="${auglensdir}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"

    if test ! -d "${conftemp}"; then
        auglensdir='/usr/share/augeas/lenses/dist'
        if test ! -d "${auglensdir}"; then
            auglensdir='/usr/share/augeas/lenses'
            if test ! -d "${auglensdir}"; then
                auglensdir=''
            fi
        fi
    fi
fi

dnl ### NUT_CHECK_LIBREGEX ### Detect below as part of libusb etc.
dnl ### LIBREGEX_LIBS=''
dnl Disable Hotplug, DevD and udev support on Windows
dnl (useful when cross-compiling)
case "${target_os}" in
    *mingw* )
        dnl TODO: Actually detect it? See also nut_check_libregex.m4 for same.
        dnl Here we assumed from practice that it is available...
        dnl ### if test x"${LIBREGEX_LIBS}" = x ; then
        dnl ###     LIBREGEX_LIBS='-lregex'
        dnl ### fi
        hotplugdir=''
        udevdir=''
        devddir=''
        ;;
    * )
        hotplugdir='/etc/hotplug'
        if test ! -d "${hotplugdir}"; then
            hotplugdir=''
        fi

        udevdir='/lib/udev'
        if test ! -d "${udevdir}"; then
            udevdir='/etc/udev'
            if test ! -d "${udevdir}"; then
                udevdir=''
            fi
        fi

        devddir='/usr/local/etc/devd'
        if test ! -d "${devddir}"; then
            devddir='/etc/devd'
            if test ! -d "${devddir}"; then
               devddir=''
            fi
        fi
        ;;
esac

dnl ---------------------------------------------------------------------
dnl Note: this deals with run-time settings so that the newly built
dnl programs can be "just executed" to use same configuration files
dnl and filesystem object permissions as an older deployment of NUT
dnl on this system; this specifically does not deal with trying to
dnl use same prefix and other paths to fully replace an older setup
dnl (a different option might be crafted to do that, but really the
dnl arcane distro-dependent packaging recipes are a better way here).
dnl This feature is intended for users who want to see if a custom
dnl build of NUT supports their hardware or other use-cases better.
NUT_ARG_ENABLE([inplace-runtime],
    [Request configure option defaults for runtime user/group/confpath based on currently installed NUT (to extent these can be detected)],
    [no])

dnl Check for not re-entering in this run - whether NUT_VERSION_DEPLOYED is set
AS_IF([test x"$nut_enable_inplace_runtime" = xyes -a x"${NUT_VERSION_DEPLOYED-}" = x], [
    AC_MSG_NOTICE([checking for location, CONFIG_FLAGS and version of an already deployed NUT build (if it reports those)])

    dnl If existing NUT installation reports its build options, re-run this
    dnl script with those flags (overridden by any options passed currently):
    conftemp="${sbindir}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    PREFIX_SBINDIR="${conftemp}"

    conftemp="${bindir}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    PREFIX_BINDIR="${conftemp}"

    dnl Not-set CGI or DRV paths would be defaulted in due time,
    dnl probably to bindir. Do not enforce any opinions here.
    conftemp="${with_cgipath}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    PREFIX_CGIDIR="${conftemp}"
    AS_CASE([${PREFIX_CGIDIR}], [yes|no], [PREFIX_CGIDIR=""])

    conftemp="${with_drvpath}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    PREFIX_DRVDIR="${conftemp}"
    AS_CASE([${PREFIX_DRVDIR}], [yes|no], [PREFIX_DRVDIR=""])

    DEPLOYED_SBINDIR="${PREFIX_SBINDIR}"
    DEPLOYED_BINDIR="${PREFIX_BINDIR}"
    DEPLOYED_CGIDIR="${PREFIX_CGIDIR}"
    DEPLOYED_DRVDIR="${PREFIX_DRVDIR}"
    dnl Note use of AC_PATH_PROG for specific pathname (not AC_CHECK_PROGS which picks filename variants)!
    dnl Note: "ordinary" users might not have "sbin" in their default PATH, so appending it:
    dnl Note: in some systems, the file in PATH is a shell
    dnl       wrapper for /etc/nut/nut.conf MODE support
    AC_PATH_PROG([DEPLOYED_UPSD], [upsd], [], [${PREFIX_SBINDIR}:${PATH}:/sbin:/usr/sbin:/usr/local/sbin])
    dnl ...however "upsc" is a userland tool so should be there:
    AC_PATH_PROG([DEPLOYED_UPSC], [upsc], [], [${PREFIX_BINDIR}:${PATH}])
    dnl Assume some driver that is commonly/always installed; check also Debian-ish packaged locations:
    AC_PATH_PROG([DEPLOYED_DUMMYUPS], [dummy-ups], [], [${PREFIX_DRVDIR}:${PREFIX_BINDIR}:${PATH}:/usr/lib/nut:/lib/nut])
    dnl The CGI client suite is very optional, may well be absent:
    AC_PATH_PROG([DEPLOYED_UPSIMAGE], [upsimage.cgi], [], [${PREFIX_CGIDIR}:${PREFIX_BINDIR}:${PATH}:/usr/lib/cgi-bin/nut:/usr/libexec/cgi-bin/nut:/usr/libexec/nut:/usr/libexec/nut/cgi-bin:/usr/lib/nut:/usr/lib/nut/cgi-bin])
    AS_IF([test -x "${DEPLOYED_UPSD}"], [
        AX_REALPATH([$DEPLOYED_UPSD], [DEPLOYED_UPSD])
        DEPLOYED_SBINDIR="`dirname \"${DEPLOYED_UPSD}\"`"
        ])
    AS_IF([test -x "${DEPLOYED_UPSC}"], [
        AX_REALPATH([$DEPLOYED_UPSC], [DEPLOYED_UPSC])
        DEPLOYED_BINDIR="`dirname \"${DEPLOYED_UPSC}\"`"
        ])
    AS_IF([test -x "${DEPLOYED_DUMMYUPS}"], [
        AX_REALPATH([$DEPLOYED_DUMMYUPS], [DEPLOYED_DUMMYUPS])
        DEPLOYED_DRVDIR="`dirname \"${DEPLOYED_DUMMYUPS}\"`"
        ])
    AS_IF([test -x "${DEPLOYED_UPSIMAGE}"], [
        AX_REALPATH([$DEPLOYED_UPSIMAGE], [DEPLOYED_UPSIMAGE])
        DEPLOYED_CGIDIR="`dirname \"${DEPLOYED_UPSIMAGE}\"`"
        ])

    DEPLOYED_PREFIX=""
    AS_IF([test -d "${DEPLOYED_SBINDIR}"],
        [DEPLOYED_PREFIX="`dirname \"${DEPLOYED_SBINDIR}\"`"],
        [AS_IF([test -d "${DEPLOYED_BINDIR}"],
            [DEPLOYED_PREFIX="`dirname \"${DEPLOYED_BINDIR}\"`"])]
    )

    AC_MSG_CHECKING([for CONFIG_FLAGS of an already deployed NUT build (if it reports those)])

    CONFIG_FLAGS_DEPLOYED=""
    NUT_VERSION_DEPLOYED=""
    DEPLOYED_LIBDIR=""
    dnl TODO: Similar query can be done for BINDIR tools
    dnl and for libupsclient-config if deployed locally
    dnl First check upsc, dummy-ups or nut-scanner (TBD)
    dnl to detect not only version and CONFIG_OPTS but
    dnl also the shared library location the best we can.
    for DEPLOYED_TOOL in \
        "${DEPLOYED_UPSC}" \
        "${DEPLOYED_DUMMYUPS}" \
        "${DEPLOYED_UPSD}" \
    ; do
        AS_IF([test x"${DEPLOYED_TOOL}" = x], [continue])
        AS_IF([test -x "${DEPLOYED_TOOL}"], [], [continue])

        AC_MSG_CHECKING([for CONFIG_FLAGS from ${DEPLOYED_TOOL}])
        CONFIG_FLAGS_DEPLOYED="`\"${DEPLOYED_TOOL}\" -DV 2>&1 | ${GREP} 'configured with flags:' | head -1 | sed 's,^.*configured with flags: *,,'`" \
        && test x"${CONFIG_FLAGS_DEPLOYED}" != x \
        || CONFIG_FLAGS_DEPLOYED=""

        dnl NOTE: Currntly NUT_VERSION_DEPLOYED is just informative (or a flag
        dnl that we've "reentered" the configuration script), so we tolerate a
        dnl better detailed string that is more than just a version, e.g.:
        dnl   2.8.2.1829-1829+g8f8a4f417 (development iteration after 2.8.2) built with gcc (Debian 10.2.1-6) 10.2.1 20210110
        NUT_VERSION_DEPLOYED="`\"${DEPLOYED_TOOL}\" -DV 2>&1 | ${GREP} 'configured with flags:' | head -1 | sed -e 's,^.*Network UPS Tools version \(.*\) configured with flags:.*$,\1,' -e 's, and *$,,'`" \
        && test x"${NUT_VERSION_DEPLOYED}" != x \
        || NUT_VERSION_DEPLOYED=""

        dnl FIXME: Find some more portable solution? Use a platform-dependent
        dnl  "case" or various toolkits?
        dnl  * Probably no need to fuss for Windows builds, as they would
        dnl    anyway use the DLL near EXE after installation.
        AS_IF([test -x "${LDD}" 2>/dev/null], [
            for TOKEN in `$LDD "${DEPLOYED_TOOL}" 2>&1 | ${GREP} libupsclient` ; do
                case "${TOKEN}" in
                    /*/libupsclient*) DEPLOYED_LIBDIR="`dirname \"$TOKEN\"`" ;;
                esac
            done
        ])

        AS_IF([test x"${CONFIG_FLAGS_DEPLOYED}${NUT_VERSION_DEPLOYED}" = x], [], [break])
    done

    AS_IF([test x"${CONFIG_FLAGS_DEPLOYED}" != x], [
        AC_MSG_RESULT([CONFIG_FLAGS_DEPLOYED: ${CONFIG_FLAGS_DEPLOYED}])
    ],[
        AC_MSG_RESULT([CONFIG_FLAGS_DEPLOYED: not reported])
    ])

    dnl Account for custom paths if known/found:
    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--prefix=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--prefix="*) prefix="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ;;
                esac
            done
        ]
    )

    AS_IF([test x"${DEPLOYED_PREFIX}" != x && test x"${DEPLOYED_PREFIX}" != x"${prefix}"],
        AC_MSG_WARN([Deployed NUT installation uses a PREFIX different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_PREFIX}' vs. '${prefix}'])
        [AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
            [*--prefix=*], [],
            [CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --prefix='${DEPLOYED_PREFIX}'"
             dnl Help re-evaluate it from verbatim defaults in later
             dnl deployed path determinations e.g. for data(root)dir:
             prefix="${DEPLOYED_PREFIX}"
        ])
    ])
    dnl FIXME? Re-evaluate cgipath and/or drvpath if they are defined with a
    dnl verbatim '${prefix}' inside, and no hits found in earlier attempts?

    AS_IF([test x"${DEPLOYED_SBINDIR}" != x && test x"${DEPLOYED_SBINDIR}" != x"${PREFIX_SBINDIR}"],
        AC_MSG_WARN([Deployed NUT installation uses a SBINDIR different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_SBINDIR}' vs. '${PREFIX_SBINDIR}' ('${sbindir}')])
        [AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
            [*--sbindir=*], [],
            [CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --sbindir='${DEPLOYED_SBINDIR}'"])
    ])

    AS_IF([test x"${DEPLOYED_BINDIR}" != x && test x"${DEPLOYED_BINDIR}" != x"${PREFIX_BINDIR}"],
        AC_MSG_WARN([Deployed NUT installation uses a BINDIR different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_BINDIR}' vs. '${PREFIX_BINDIR}' ('${bindir}')])
        [AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
            [*--bindir=*], [],
            [CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --bindir='${DEPLOYED_BINDIR}'"])
    ])

    AS_IF([test x"${DEPLOYED_CGIDIR}" != x && test x"${DEPLOYED_CGIDIR}" != x"${PREFIX_CGIDIR}"],
        AC_MSG_WARN([Deployed NUT installation uses a CGIDIR different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_CGIDIR}' vs. '${PREFIX_CGIDIR}' ('${with_cgipath}')])
        [AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
            [*--with-cgipath=*], [],
            [CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --with-cgipath='${DEPLOYED_CGIDIR}'"])
    ])

    AS_IF([test x"${DEPLOYED_DRVDIR}" != x && test x"${DEPLOYED_DRVDIR}" != x"${PREFIX_DRVDIR}"],
        AC_MSG_WARN([Deployed NUT installation uses a DRVDIR different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_DRVDIR}' vs. '${PREFIX_DRVDIR}' ('${with_drvpath}')])
        [AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
            [*--with-drvpath=*], [],
            [CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --with-drvpath='${DEPLOYED_DRVDIR}'"])
    ])


    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--datarootdir=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--datarootdir="*) datarootdir="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ;;
                esac
            done
        ]
    )

    conftemp="${datarootdir}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    PREFIX_DATAROOTDIR="${conftemp}"
    dnl The dataroot dir (system-wide) here is used to search for datadir candidate info

    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--datadir=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--datadir="*) datadir="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ;;
                esac
            done
        ]
    )

    conftemp="${datadir}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    PREFIX_DATADIR="${conftemp}"
    DATADIR="${PREFIX_DATADIR}"
    DEPLOYED_DATADIR=""

    AS_IF([test -f "${PREFIX_DATAROOTDIR}/nut/cmdvartab" || test -f "${PREFIX_DATAROOTDIR}/nut/driver.list"],
        [DEPLOYED_DATADIR="${PREFIX_DATAROOTDIR}/nut"],
        [AS_IF([test -f "${PREFIX_DATAROOTDIR}/cmdvartab" || test -f "${PREFIX_DATAROOTDIR}/driver.list"],
            [DEPLOYED_DATADIR="${PREFIX_DATAROOTDIR}"],
            [dnl FIXME: Be careful on WIN32 and its "find" vs. that in MINGW?
             DEPLOYED_DATADIR="`find \"${PREFIX_DATAROOTDIR}\" -name cmdvartab | head -1 | sed 's,/@<:@^/@:>@*$,,'`" || DEPLOYED_DATADIR=""
             AS_IF([test -z "${DEPLOYED_DATADIR}"], [DEPLOYED_DATADIR="`find \"${PREFIX_DATAROOTDIR}\" -name driver.list | head -1 | sed 's,/@<:@^/@:>@*$,,'`" || DEPLOYED_DATADIR=""])
            ]
        )]
    )
    AS_IF([test -z "${DEPLOYED_DATADIR}" && test -d "${PREFIX_DATAROOTDIR}/nut"], [DEPLOYED_DATADIR="${PREFIX_DATAROOTDIR}/nut"])

    AS_IF([test x"${DEPLOYED_DATADIR}" != x && test x"${DEPLOYED_DATADIR}" != x"${PREFIX_DATADIR}"],
        AC_MSG_WARN([Deployed NUT installation uses a DATADIR different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_DATADIR}' vs. '${PREFIX_DATADIR}' ('${datadir}')])
        [AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
            [*--datadir=*], [],
            [CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --datadir='${DEPLOYED_DATADIR}'"
             DATADIR="${DEPLOYED_DATADIR}"
            ])
    ])

    HAVE_DEPLOYED_CONFPATH=false
    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--sysconfdir=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--sysconfdir="*) sysconfdir="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ; HAVE_DEPLOYED_CONFPATH=true ;;
                esac
            done
        ])
    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--with-confdir=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--with-confdir="*) nut_with_confdir="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ; HAVE_DEPLOYED_CONFPATH=true ;;
                esac
            done
        ])
    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--with-confdir-suffix=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--with-confdir-suffix="*) nut_with_confdir_suffix="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ; HAVE_DEPLOYED_CONFPATH=true ;;
                esac
            done
        ])
    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--with-confdir-examples=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--with-confdir-examples="*) nut_with_confdir_examples="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ;;
                esac
            done
        ],[
            nut_with_confdir_examples='${confdir}'
        ])

    AS_IF([test x"${HAVE_DEPLOYED_CONFPATH}" = xfalse], [
        dnl If there was no custom --sysconfdir=/etc/myNUT passed,
        dnl try to default it to something from existing deployment.
        dnl NOTE: Single-quotes are correct for autotools default,
        dnl expanded at runtime (see conftemp tricks below)

        conftemp="${sysconfdir}"
        eval conftemp=\"${conftemp}\"
        eval conftemp=\"${conftemp}\"
        dnl Evaluated here for the message; CONFPATH will be re-evaluated
        dnl below, after we decide on the sysconfdir value we really like.
        PREFIX_SYSCONFDIR="${conftemp}"

        dnl Default definition
        nut_with_confdir_suffix=""
        nut_with_confdir='${sysconfdir}${confdir_suffix}'

        AC_MSG_CHECKING([for in-place replacement default sysconfdir, better than '${PREFIX_SYSCONFDIR}' ('${sysconfdir}')])
        DEPLOYED_SYSCONFDIR=""

        dnl TODO: Any more reasonable defaults? Pile them on here :)
        for D in \
            /etc/nut /etc/ups \
            /usr/etc/nut /usr/etc/ups \
            /usr/local/etc/nut /usr/local/etc/ups \
            /usr/local/nut/etc /usr/local/ups/etc \
        ; do
            if test -f "$D/ups.conf" || test -f "$D/upsmon.conf" \
            || test -h "$D/ups.conf" || test -h "$D/upsmon.conf" \
            || ( (test -f "$D/upsd.conf" || test -h "$D/upsd.conf") && (test -f "$D/upsd.users" || test -h "$D/upsd.users") ) \
            ; then
                DEPLOYED_SYSCONFDIR="$D"
                break
            else
                if test -d "$D/" && test ! -r "$D/" ; then
                    dnl Keeping order of preference defined by "for" loop:
                    AC_MSG_WARN([Picking directory '${D}' which exists but current build user may not read])
                    DEPLOYED_SYSCONFDIR="$D"
                    break
                fi
            fi
        done

        AS_IF([test -n "${DEPLOYED_SYSCONFDIR}"], [
            AC_MSG_RESULT([${DEPLOYED_SYSCONFDIR}])
            dnl May be used in searches below:
            sysconfdir="${DEPLOYED_SYSCONFDIR}"
            CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --sysconfdir='${DEPLOYED_SYSCONFDIR}'"
        ], [
            AC_MSG_RESULT([not detected])
        ])
    ])

    dnl Prepare paths that may be used in user/group searches below:
    conftemp="${nut_with_confdir}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    CONFPATH="${conftemp}"

    conftemp="${nut_with_confdir_examples}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    CONFPATH_EXAMPLES="${conftemp}"

    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--libdir=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--libdir="*) libdir="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ;;
                esac
            done
        ]
    )

    conftemp="${libdir}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    PREFIX_LIBDIR="${conftemp}"
    LIBDIR="${PREFIX_LIBDIR}"

    AS_IF([test x"${DEPLOYED_LIBDIR}" != x && test x"${DEPLOYED_LIBDIR}" != x"${PREFIX_LIBDIR}"],
        AC_MSG_WARN([Deployed NUT installation uses a LIBDIR different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_LIBDIR}' vs. '${PREFIX_LIBDIR}' ('${libdir}')])
        [AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
            [*--libdir=*], [],
            [CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --libdir='${DEPLOYED_LIBDIR}'"
             LIBDIR="${DEPLOYED_LIBDIR}"
            ])
    ])

    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--libexecdir=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--libexecdir="*) libexecdir="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ;;
                esac
            done
        ]
    )

    conftemp="${libexecdir}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    LIBEXECDIR="${conftemp}"

    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--with-pkgconfig-dir=*], [
            for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
                case "$F" in
                    "--with-pkgconfig-dir="*) pkgconfigdir="`echo \"$F\" | ( IFS='=' read K V ; echo \"$V\" )`" ;;
                esac
            done
        ]
    )

    dnl pkgconfigdir may have more indirections:
    conftemp="${pkgconfigdir}"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    eval conftemp=\"${conftemp}\"
    PKGCONFIGDIR="${conftemp}"

    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--with-group=*], [],
        [
        AC_MSG_CHECKING([for in-place replacement default group (better than '${RUN_AS_GROUP}')])
        nut_inplace_group=""
        AS_IF([test -d "${udevdir}/rules.d"],
            [for F in "${udevdir}/rules.d"/*-nut-*.rules ; do
                if test -s "$F" ; then
                    nut_inplace_group="`${GREP} GROUP= \"$F\" | head -1 | sed 's,^.* GROUP=\"*\(.*\)\"*.*$,\1,'`" \
                    && test -n "`${PROBE_OS_GROUP} \"${nut_inplace_group}\"`" \
                    && AC_MSG_RESULT([Got from ${F}]) \
                    && break \
                    || nut_inplace_group=""
                fi
             done
            ])

        AS_IF([test -z "${nut_inplace_group}"],
            [AS_IF([test -n "`${PROBE_OS_GROUP} nut`"], [nut_inplace_group="nut"],
                [AS_IF([test -n "`${PROBE_OS_GROUP} ups`"], [nut_inplace_group="ups"])])])

        AS_IF([test -n "${nut_inplace_group}"], [
            AC_MSG_RESULT([${nut_inplace_group}])
            CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --with-group='${nut_inplace_group}'"
        ], [
            AC_MSG_RESULT([not detected])
        ])
    ])

    AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
        [*--with-user=*], [],
        [
        AC_MSG_CHECKING([for in-place replacement default user (better than '${RUN_AS_USER}')])
        nut_inplace_user=""

        dnl Beside currently active setting, check the built-in default sugestion
        AS_IF([test -s "${CONFPATH}/upsmon.conf"],
            [for nut_inplace_user in \
                `${EGREP} '^ *RUN_AS_USER' "${CONFPATH}/upsmon.conf" | awk '{print $2}'`\
                `${EGREP} '^ *##*RUN_AS_USER' "${CONFPATH}/upsmon.conf" | awk '{print $2}'`\
                `${EGREP} '^ *##*  *RUN_AS_USER' "${CONFPATH}/upsmon.conf" | awk '{print $3}'`\
            ; do \
                AS_IF([test -z "${nut_inplace_user}"], [
                    test -n "`${PROBE_OS_USER} \"${nut_inplace_user}\"`" \
                    && AC_MSG_RESULT([Got from ${CONFPATH}/upsmon.conf]) \
                    || nut_inplace_user=""])
             done
        ])

        AS_IF([test -s "${CONFPATH}/upsmon.conf.sample" && test -z "${nut_inplace_user}"],
            [for nut_inplace_user in \
                `${EGREP} '^ *RUN_AS_USER' "${CONFPATH}/upsmon.conf.sample" | awk '{print $2}'`\
                `${EGREP} '^ *##*RUN_AS_USER' "${CONFPATH}/upsmon.conf.sample" | awk '{print $2}'`\
                `${EGREP} '^ *##*  *RUN_AS_USER' "${CONFPATH}/upsmon.conf.sample" | awk '{print $3}'`\
            ; do \
                AS_IF([test -z "${nut_inplace_user}"], [
                    test -n "`${PROBE_OS_USER} \"${nut_inplace_user}\"`" \
                    && AC_MSG_RESULT([Got from ${CONFPATH}/upsmon.conf]) \
                    || nut_inplace_user=""])
             done
        ])

        dnl Note: with default short inplace and no prefix, this would look under
        dnl /usr/local/ups/lib/pkgconfig which may be irrelevant for packaged setups

        dnl TODO: Any more reasonable defaults? Pile them on here :)
        for F in \
            "${PKGCONFDIR}/libupsclient.pc" \
            "${PKGCONFDIR}/libnutclient.pc" \
            "${LIBDIR}/pkgconfig/libupsclient.pc" \
            "${LIBDIR}/pkgconfig/libnutclient.pc" \
        ; do
            AS_IF([test -z "${nut_inplace_user}" && test -s "$F"],
                [nut_inplace_user="`${EGREP} '^ *nutuser=' \"$F\" | sed 's,^ *nutuser=,,'`" \
                && test -n "`${PROBE_OS_USER} \"${nut_inplace_user}\"`" \
                && AC_MSG_RESULT([Got from $F]) \
                || nut_inplace_user=""
            ])
        done

        AS_IF([test -z "${nut_inplace_user}"],
            [AS_IF([test -n "`${PROBE_OS_USER} nut`"], [nut_inplace_user="nut"],
                [AS_IF([test -n "`${PROBE_OS_USER} ups`"], [nut_inplace_user="ups"])])])

        AS_IF([test -n "${nut_inplace_user}"], [
            AC_MSG_RESULT([${nut_inplace_user}])
            CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --with-user='${nut_inplace_user}'"
        ], [
            AC_MSG_RESULT([not detected])
        ])
    ])

    AS_IF([test x"${CONFIG_FLAGS_DEPLOYED}" != x], [
        AC_MSG_NOTICE([Detected CONFIG_FLAGS for an already deployed NUT installation, using them for --inplace-runtime configuration (restarting script)])
        dnl For multiply-specified flags with conflicting values, last mention wins:
        AC_MSG_NOTICE([exec "$0" $CONFIG_FLAGS_DEPLOYED $CONFIG_FLAGS --disable-inplace-runtime])
        AS_IF([test x"${NUT_VERSION_DEPLOYED}" != x], [
            AC_MSG_NOTICE([NUT_VERSION_DEPLOYED: ${NUT_VERSION_DEPLOYED}])
        ],[
            NUT_VERSION_DEPLOYED="<reenter>"
        ])
        export NUT_VERSION_DEPLOYED
        dnl # Avoid replacement after re-entering:
        test -n "${CONFIG_CFLAGS-}"   || CONFIG_CFLAGS=" "
        test -n "${CONFIG_CXXFLAGS-}" || CONFIG_CXXFLAGS=" "
        test -n "${CONFIG_CPPFLAGS-}" || CONFIG_CPPFLAGS=" "
        test -n "${CONFIG_LDFLAGS-}"  || CONFIG_LDFLAGS=" "
        export CONFIG_CFLAGS
        export CONFIG_CXXFLAGS
        export CONFIG_CPPFLAGS
        export CONFIG_LDFLAGS

        AC_MSG_NOTICE([Moving config.log of the original invocation to config.log.inplace-outer just before exec...])
        mv -f config.log config.log.inplace-outer || true

        eval exec "$0" $CONFIG_FLAGS_DEPLOYED $CONFIG_FLAGS --disable-inplace-runtime
    ],[
        AC_MSG_NOTICE([No CONFIG_FLAGS were reported or discovered from existing NUT deployment (if any); restarting script for a clean run])
        NUT_VERSION_DEPLOYED="<reenter>"
        export NUT_VERSION_DEPLOYED
        dnl # Avoid replacement after re-entering:
        test -n "${CONFIG_CFLAGS-}"   || CONFIG_CFLAGS=" "
        test -n "${CONFIG_CXXFLAGS-}" || CONFIG_CXXFLAGS=" "
        test -n "${CONFIG_CPPFLAGS-}" || CONFIG_CPPFLAGS=" "
        test -n "${CONFIG_LDFLAGS-}"  || CONFIG_LDFLAGS=" "
        export CONFIG_CFLAGS
        export CONFIG_CXXFLAGS
        export CONFIG_CPPFLAGS
        export CONFIG_LDFLAGS

        AC_MSG_NOTICE([Moving config.log of the original invocation to config.log.inplace-outer just before exec...])
        mv -f config.log config.log.inplace-outer || true

        AC_MSG_NOTICE([exec "$0" $CONFIG_FLAGS --disable-inplace-runtime])
        eval exec "$0" $CONFIG_FLAGS --disable-inplace-runtime
    ])
])

dnl ---------------------------------------------------------------------
dnl Define directory where LIBOBJS replacement functions are
AC_CONFIG_LIBOBJ_DIR([common])

dnl +-------------------------------------------------------------------

AC_PROG_INSTALL
AC_PROG_MKDIR_P
AC_PROG_LN_S
AC_PATH_PROG(AR, ar)
AC_CHECK_TOOL(RANLIB, ranlib, :)
dnl Postpone call to LT_INIT/AC_CONFIG_FILES to allow disabling static lib
AC_C_BIGENDIAN
AC_C_INLINE
AC_C_FLEXIBLE_ARRAY_MEMBER
AC_C_VARARRAYS

NUT_ARG_ENABLE([keep_nut_report_feature],
    [Request that we keep config.nut_report_feature.log (normally deleted by configure script after displaying)],
    [no])

AS_IF([test x"${NUT_SOURCE_GITREV}" = x],
    [NUT_REPORT([configured version], [${PACKAGE_VERSION}])],
    [AS_IF([test x"${NUT_SOURCE_GITREV}" = x"${PACKAGE_VERSION}"],
        [NUT_REPORT([configured version], [${PACKAGE_VERSION} ${NUT_SOURCE_GITREV_DEVREL}])],
        [NUT_REPORT([configured version], [${PACKAGE_VERSION} (${NUT_SOURCE_GITREV}) ${NUT_SOURCE_GITREV_DEVREL}])])
    ])
NUT_REPORT([Documentation website base URL], [${NUT_WEBSITE_BASE}])
AC_DEFINE_UNQUOTED([NUT_WEBSITE_BASE], "${NUT_WEBSITE_BASE}", [Documentation website base URL, no trailing slash])

dnl Note: the compiler/pragma/attr methods below are custom for NUT codebase:
NUT_COMPILER_FAMILY

dnl Note: DO NOT AC_DEFINE the "FULL" items: they are generally multi-line.
AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
    NUT_REPORT_TARGET_WITHOUT_AC_DEFINE([CC_VERSION_FULL],  ["${CC_VERSION_FULL}"],  [Version and other details of C compiler])
    NUT_REPORT_TARGET_WITHOUT_AC_DEFINE([CXX_VERSION_FULL], ["${CXX_VERSION_FULL}"], [Version and other details of C++ compiler])
    NUT_REPORT_TARGET_WITHOUT_AC_DEFINE([CPP_VERSION_FULL], ["${CPP_VERSION_FULL}"], [Version and other details of C preprocessor])
])
NUT_REPORT_TARGET([CC_VERSION],  ["${CC_VERSION}"],  [Compact version of C compiler])
NUT_REPORT_TARGET([CXX_VERSION], ["${CXX_VERSION}"], [Compact version of C++ compiler])
NUT_REPORT_TARGET([CPP_VERSION], ["${CPP_VERSION}"], [Compact version of C preprocessor])

dnl Help find warning/error details in a wall of text (must be processed before NUT_COMPILER_FAMILY_FLAGS):
NUT_ARG_ENABLE([Wcolor],
    [Request that compiler output is colorized (no = leave it up to compiler defaults)],
    [no])
NUT_COMPILER_FAMILY_FLAGS
AX_C_PRAGMAS
AX_C___ATTRIBUTE__
AX_C_PRINTF_STRING_NULL

dnl Check if the system provides a boolean type and how it is spelled
NUT_CHECK_BOOL

dnl All current systems provide time.h; it need not be checked for.
dnl Not all systems provide sys/time.h, but those that do, all allow
dnl you to include it and time.h simultaneously.
dnl NUT codebase provides the include/timehead.h to wrap these nuances.
AC_CHECK_HEADERS_ONCE([sys/time.h time.h sys/types.h])
dnl ###obsolete### AC_HEADER_TIME
AS_IF([test "$ac_cv_header_sys_time_h" = yes],
    [AC_DEFINE([TIME_WITH_SYS_TIME],[1],[Define to 1 if you can safely include both <sys/time.h>
         and <time.h>.  This macro is deemed obsolete by autotools.])
    ], [])

CODE_TIMEINCL="
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
"

dnl TEMPORARY to allow certain linux-only buildable drivers
AC_CHECK_HEADERS_ONCE([linux/serial.h])
AM_CONDITIONAL(HAVE_LINUX_SERIAL_H, test x"${ac_cv_header_linux_serial_h}" = xyes)

AC_CHECK_HEADERS_ONCE([fcntl.h sys/stat.h sys/socket.h netdb.h])
AC_CHECK_FUNCS(flock lockf fcvt fcvtl dup dup2 abs_val abs)

AC_CHECK_HEADER([float.h],
    [AC_DEFINE([HAVE_FLOAT_H], [1],
        [Define to 1 if you have <float.h>.])])
AC_CHECK_HEADER([math.h],
    [AC_DEFINE([HAVE_MATH_H], [1],
        [Define to 1 if you have <math.h>.])])

AC_CHECK_DECLS([fabs, fabsf, fabsl, pow10, round], [], [],
[#ifdef HAVE_MATH_H
# include <math.h>
#endif
#ifdef HAVE_FLOAT_H
# include <float.h>
#endif
])

AC_CHECK_HEADER([limits.h],
    [AC_DEFINE([HAVE_LIMITS_H], [1],
        [Define to 1 if you have <limits.h>.])])

AC_CHECK_HEADER([stdlib.h],
    [AC_DEFINE([HAVE_STDLIB_H], [1],
        [Define to 1 if you have <stdlib.h>.])])

AC_CHECK_DECLS(realpath, [], [],
[#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
])

AC_CHECK_HEADER([signal.h],
    [AC_DEFINE([HAVE_SIGNAL_H], [1],
        [Define to 1 if you have <signal.h>.])])

AC_CHECK_HEADER([sys/signal.h],
    [AC_DEFINE([HAVE_SYS_SIGNAL_H], [1],
        [Define to 1 if you have <sys/signal.h>.])])

AC_CHECK_HEADER([sys/resource.h],
    [AC_MSG_CHECKING([for struct rlimit and getrlimit()])
     AC_LANG_PUSH([C])
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
#include <sys/resource.h>
],
[struct rlimit limit;
getrlimit(RLIMIT_NOFILE, &limit);
/* Do not care about actual return value in this test,
 * normally check for non-zero meaning to look in errno */
]
        )],
        [AC_DEFINE([HAVE_SYS_RESOURCE_H], [1],
            [Define to 1 if you have <sys/resource.h> with usable struct rlimit and getrlimit().])
         AC_MSG_RESULT([ok])
        ],
        [AC_MSG_RESULT([no])]
     )
     AC_LANG_POP([C])
    ]
)

AC_CHECK_HEADER([poll.h],
    [AC_DEFINE([HAVE_POLL_H], [1],
        [Define to 1 if you have <poll.h>.])])

SEMLIBS=""
nut_have_semaphore_h=no
nut_have_semaphore_unnamed=no
nut_have_semaphore_named=no
AC_CHECK_HEADER([semaphore.h],
    [AC_DEFINE([HAVE_SEMAPHORE_H], [1],
        [Define to 1 if you have <sys/semaphore.h>.])
     nut_have_semaphore_h=yes

     AC_LANG_PUSH([C])
     myLIBS="${LIBS}"
     LIBS=""
     SEMLIBS_LRT=""

     dnl Solaris 8 builds complain about indirect dependency involved:
     dnl   sem_init   nut_scanner-nut-scanner.o
     dnl   (symbol belongs to implicit dependency /usr/lib/librt.so.1)
     AC_SEARCH_LIBS([sem_init], [pthread], [], [
        unset ac_cv_search_sem_init
        AC_SEARCH_LIBS([sem_init], [pthread], [SEMLIBS_LRT=" -lrt"], [], [-lrt])])
     AC_SEARCH_LIBS([sem_open], [pthread], [], [
        unset ac_cv_search_sem_open
        AC_SEARCH_LIBS([sem_open], [pthread], [SEMLIBS_LRT=" -lrt"], [], [-lrt])])

     AS_CASE([${ac_cv_search_sem_init}], [no*], [], [SEMLIBS="${ac_cv_search_sem_init}"])
     AS_CASE([${ac_cv_search_sem_open}], [no*], [], ["${SEMLIBS}"], [], [SEMLIBS="${ac_cv_search_sem_open}"])
     SEMLIBS="${SEMLIBS}${SEMLIBS_LRT}"

     LIBS="${SEMLIBS}"

     AC_MSG_CHECKING([for sem_t, sem_init() and sem_destroy()])
     AX_RUN_OR_LINK_IFELSE([AC_LANG_PROGRAM([
#include <semaphore.h>
],
[sem_t semaphore;
sem_init(&semaphore, 0, 4);
sem_destroy(&semaphore);
/* Do not care about actual return value in this test,
 * normally check for non-zero meaning to look in errno */
]
        )],
        [AC_DEFINE([HAVE_SEMAPHORE_UNNAMED], [1],
            [Define to 1 if you have <sys/semaphore.h> with usable sem_t, sem_init() and sem_destroy() for unnamed semaphores.])
         AC_MSG_RESULT([ok])
         nut_have_semaphore_unnamed=yes
        ],
        [AC_MSG_RESULT([no])]
     )

     AC_MSG_CHECKING([for sem_t, sem_open() and sem_close()])
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
#include <semaphore.h>
#ifdef HAVE_FCNTL_H
# include <fcntl.h>           /* For O_* constants */
#endif
#ifdef SYS_STAT_H
# include <sys/stat.h>        /* For mode constants */
#endif
],
[sem_t *semaphore = sem_open("/s", O_CREAT, 0644, 4);
if (semaphore != SEM_FAILED)
    sem_close(semaphore);
/* Do not care about actual return value in this test,
 * normally check for non-zero meaning to look in errno */
]
        )],
        [AC_DEFINE([HAVE_SEMAPHORE_NAMED], [1],
            [Define to 1 if you have <sys/semaphore.h> with usable sem_t, sem_open() and sem_close() for named semaphores.])
         AC_MSG_RESULT([ok])
         nut_have_semaphore_named=yes
        ],
        [AC_MSG_RESULT([no])]
     )

     LIBS="${myLIBS}"
     AC_LANG_POP([C])
    ]
)
AM_CONDITIONAL(HAVE_SEMAPHORE_LIBS, [test -n "${SEMLIBS}"])
AS_IF([test -n "${SEMLIBS}" -o x"${nut_have_semaphore_h}" = xyes -o x"${nut_have_semaphore_unnamed}" = xyes -o x"${nut_have_semaphore_named}" = xyes],
    [nut_have_semaphore_ability=yes],
    [nut_have_semaphore_ability=no])

dnl ----------------------------------------------------------------------
dnl Check for --with-threading request

NUT_ARG_WITH([threading],
    [If it is possible to parallelize some tools (e.g. nut-scanner), do so?],
    [auto])

AS_CASE(["${nut_with_threading}"],
    [""|yes], [AS_IF([test x"${nut_have_semaphore_ability}" = xyes], [], [AC_MSG_ERROR([pthread support was required but libraries not detected])])],
    [auto],[AS_IF([test x"${nut_have_semaphore_ability}" = xyes], [nut_with_threading=yes], [nut_with_threading=no])],
    [no], [],
        [AC_MSG_ERROR([Unsupported value for --with-threading option: "${nut_with_threading}"])]
)
NUT_REPORT_FEATURE([Enable support for parallelization of some tools], [${nut_with_threading}], [${SEMLIBS}],
					[WITH_THREADING], [Define to enable build with threading support])

dnl ----------------------------------------------------------------------
AC_CHECK_FUNCS(cfsetispeed tcsendbreak)
AC_CHECK_FUNCS(seteuid setsid getpassphrase)
AC_CHECK_FUNCS(on_exit setlogmask)
AC_CHECK_DECLS(LOG_UPTO, [], [], [#include <syslog.h>])

dnl These common routines are not available in strict C standard library
dnl compilation modes (not part of ANSI or later standard), only in GNU,
dnl POSIX or other extension modes. Note that on modern systems they are
dnl available, just hidden in headers - so AC_CHECK_FUNCS() finds them
dnl by adding a declaration, while the "real" codebase can't use them.
AC_MSG_NOTICE(
[-----------------------------------------------------------------------
The next few tests look for required C library routines; if something is
not found, you may need to enable a different C standard or extension macro
version. You may also have to configure without extreme warning levels
since autotools tests fail those on their own and assume system lacks
stuff (although note we try to not involve standard -W* flags here).
-----------------------------------------------------------------------])
dnl# AC_CHECK_FUNCS(strcasecmp strncasecmp,
dnl# 	[], [AC_MSG_WARN([Required C library routine not found; try adding __EXTENSIONS__])])
dnl These appear with CFLAGS="-std=c99 -D_POSIX_C_SOURCE=200112L":
dnl# Methods below currently do not cause build errors for C99+ modes so are
dnl# not tested as thoroughly as those further below:
AC_CHECK_FUNCS(strtof strtok_r fileno sigemptyset sigaction,
	[], [AC_MSG_WARN([Required C library routine not found by linker; try adding -D_POSIX_C_SOURCE=200112L])])

dnl For these we have a fallback implementation via the other,
dnl if at least one is available, so initial check is quiet.
dnl This typically pops up in POSIX vs. Windows builds:
dnl Reminder: the former checks for declarations in headers,
dnl the latter checks if known libraries suffice for linker.
dnl Might need AC_CHECK_LIBS as well to populate the list with
dnl known variants?
AC_CHECK_DECLS([localtime_r, localtime_s, gmtime_r, gmtime_s, timegm, _mkgmtime], [], [], [$CODE_TIMEINCL])
AC_CHECK_FUNCS(localtime_r localtime_s gmtime_r gmtime_s timegm _mkgmtime, [], [])

AC_MSG_CHECKING([for at least one gmtime implementation])
AS_IF([test x"${ac_cv_func_gmtime_s}-${ac_cv_func_gmtime_r}" = "xno-no" && test x"${ac_cv_have_decl_gmtime_s}-${ac_cv_have_decl_gmtime_r}" = "xno-no"], [
	AC_MSG_RESULT([no])
	AC_MSG_WARN([Required C library routine gmtime_s nor gmtime_r was not found by linker nor in headers; try adding -D_POSIX_C_SOURCE=200112L and/or -D_POSIX_THREAD_SAFE_FUNCTIONS=200112L])
	],[
	AC_MSG_RESULT([yes])
	])

AC_MSG_CHECKING([for at least one localtime implementation])
AS_IF([test x"${ac_cv_func_localtime_s}-${ac_cv_func_localtime_r}" = "xno-no" && test x"${ac_cv_have_decl_localtime_s}-${ac_cv_have_decl_localtime_r}" = "xno-no"], [
	AC_MSG_RESULT([no])
	AC_MSG_WARN([Required C library routine localtime_s nor localtime_r was not found by linker nor in headers; try adding -D_POSIX_C_SOURCE=200112L and/or -D_POSIX_THREAD_SAFE_FUNCTIONS=200112L])
	],[
	AC_MSG_RESULT([yes])
	])

AC_MSG_CHECKING([for at least one timegm implementation])
AS_IF([test x"${ac_cv_func_timegm}-${ac_cv_func__mkgmtime}" = "xno-no" && test x"${ac_cv_have_decl_timegm}-${ac_cv_have_decl__mkgmtime}" = "xno-no"], [
	AC_MSG_RESULT([no])
	AC_MSG_WARN([Required C library routine timegm nor _mkgmtime was not found by linker nor in headers])
	AC_DEFINE_UNQUOTED([WANT_TIMEGM_FALLBACK], [1], [Defined if we want to use timegm_fallback()])
	AM_CONDITIONAL([WANT_TIMEGM_FALLBACK], [true])
	],[
	AC_MSG_RESULT([yes])
	AM_CONDITIONAL([WANT_TIMEGM_FALLBACK], [false])
	])

AC_LANG_PUSH([C])

AC_CHECK_HEADER([string.h],
    [AC_DEFINE([HAVE_STRING_H], [1],
        [Define to 1 if you have <string.h>.])])

AC_CHECK_HEADER([strings.h],
    [AC_DEFINE([HAVE_STRINGS_H], [1],
        [Define to 1 if you have <strings.h>.])])

CODE_STRINGINCL='#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif'

AC_CACHE_CHECK([for strcasecmp(s1,s2)],
    [ac_cv_func_strcasecmp],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL],
            [if (strcasecmp("STR1", "str1") != 0) return 1])],
        [ac_cv_func_strcasecmp=yes], [ac_cv_func_strcasecmp=no]
    )])
AS_IF([test x"${ac_cv_func_strcasecmp}" = xyes],
    [AC_DEFINE([HAVE_STRCASECMP], 1, [defined if standard library has, and C standard allows, the strcasecmp(s1,s2) method])],
    [AC_MSG_WARN([Required C library routine strcasecmp not found; try adding __EXTENSIONS__])]
    )

AC_CACHE_CHECK([for strncasecmp(s1,s2,n)],
    [ac_cv_func_strncasecmp],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL],
            [if (strncasecmp("STR1", "strX", 2) != 0) return 1])],
        [ac_cv_func_strncasecmp=yes], [ac_cv_func_strncasecmp=no]
    )])
AS_IF([test x"${ac_cv_func_strncasecmp}" = xyes],
    [AC_DEFINE([HAVE_STRNCASECMP], 1, [defined if standard library has, and C standard allows, the strncasecmp(s1,s2,n) method])],
    [AC_MSG_WARN([Required C library routine strncasecmp not found; try adding __EXTENSIONS__])]
    )

dnl Note: this changes the original string in argument!
dnl Do not pass it constants (strdup them if needed)!
AC_CACHE_CHECK([for strlwr(s)],
    [ac_cv_func_strlwr],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL],
            [char s@<:@64@:>@ = {"Some STR1 text"} ; if (strlwr(s) == NULL) return 1])],
        [ac_cv_func_strlwr=yes], [ac_cv_func_strlwr=no]
    )])
AS_IF([test x"${ac_cv_func_strlwr}" = xyes],
    [AC_DEFINE([HAVE_STRLWR], 1, [defined if standard library has, and C standard allows, the strlwr(s1,s2) method])],
    [AC_MSG_WARN([Optional C library routine strlwr not found])]
    )

AC_CACHE_CHECK([for strsep(s1,s2)],
    [ac_cv_func_strsep],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL],
            [char arr@<:@64@:>@ = {"Some,tuple,text"} ; char *s = arr; if (strsep(&s, ",") == NULL) return 1])],
        [ac_cv_func_strsep=yes], [ac_cv_func_strsep=no]
    )])
AS_IF([test x"${ac_cv_func_strsep}" = xyes],
    [AC_DEFINE([HAVE_STRSEP], 1, [defined if standard library has, and C standard allows, the strsep(s1,s2) method])],
    [AC_MSG_WARN([Optional C library routine strsep not found])]
    )
AM_CONDITIONAL([HAVE_STRSEP], [test x"${ac_cv_func_strsep}" = "xyes"])

AC_CACHE_CHECK([for strstr(s1,s2)],
    [ac_cv_func_strstr],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL],
            [if (strstr("Some str1 text", "str1") == NULL) return 1])],
        [ac_cv_func_strstr=yes], [ac_cv_func_strstr=no]
    )])
AS_IF([test x"${ac_cv_func_strstr}" = xyes],
    [AC_DEFINE([HAVE_STRSTR], 1, [defined if standard library has, and C standard allows, the strstr(s1,s2) method])],
    [AC_MSG_ERROR([Required C library routine strstr not found])]
    )

AC_CACHE_CHECK([for strcasestr(s1,s2)],
    [ac_cv_func_strcasestr],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL],
            [if (strcasestr("Some STR1 text", "str1") == NULL) return 1])],
        [ac_cv_func_strcasestr=yes], [ac_cv_func_strcasestr=no]
    )])
AS_IF([test x"${ac_cv_func_strcasestr}" = xyes],
    [AC_DEFINE([HAVE_STRCASESTR], 1, [defined if standard library has, and C standard allows, the strcasestr(s1,s2) method])],
    [AS_IF([test x"${ac_cv_func_strlwr}" = xyes && test x"${ac_cv_func_strstr}" = xyes],
        [AC_MSG_WARN([Optional C library routine strcasestr not found; a simple wrapper will be built in])]
        [AC_MSG_WARN([Required C library routine strcasestr not found; try adding _GNU_SOURCE])]
    )])

AC_CACHE_CHECK([for strptime(s1,s2,tm)],
    [ac_cv_func_strptime],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL
$CODE_TIMEINCL
],
            [struct tm tm;
char *date = "12/30/1999";
char *p = strptime(date, "%m/%d/%Y", &tm);
if (p == NULL || *p != '\0') return 1])],
        [ac_cv_func_strptime=yes], [ac_cv_func_strptime=no]
    )])
AS_IF([test x"${ac_cv_func_strptime}" = xyes],
    [AC_DEFINE([HAVE_STRPTIME], 1, [defined if standard library has, and C standard allows, the strptime(s1,s2,tm) method])],
    [AC_MSG_WARN([Optional C library routine strptime not found; try adding _GNU_SOURCE; a fallback implementation will be built in])]
    )
dnl Note: per Linux headers, this may need __USE_XOPEN (features.h)
dnl which is enabled by _XOPEN_SOURCE via _GNU_SOURCE on the platform.
AM_CONDITIONAL([HAVE_STRPTIME], [test x"${ac_cv_func_strptime}" = "xyes"])

AC_CACHE_CHECK([for clock_gettime(CLOCK_MONOTONIC,ts)],
    [ac_cv_func_clock_gettime],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL
$CODE_TIMEINCL
],
            [struct timespec monoclock_ts;
int got_monoclock = clock_gettime(CLOCK_MONOTONIC, &monoclock_ts);
if (monoclock_ts.tv_sec < 0 || monoclock_ts.tv_nsec < 0) return 1])],
        [ac_cv_func_clock_gettime=yes], [ac_cv_func_clock_gettime=no]
    )])
AS_IF([test x"${ac_cv_func_clock_gettime}" = xyes],
    [AC_DEFINE([HAVE_CLOCK_GETTIME], 1, [defined if standard library has, and C standard allows, the clock_gettime(clkid,ts) method])
     AC_DEFINE([HAVE_CLOCK_MONOTONIC], 1, [defined if standard library has, and C standard allows, the CLOCK_MONOTONIC macro or token])],
    [AC_MSG_WARN([Optional C library routine clock_gettime not found; will not be used in notifications])]
    )
dnl Currently these two are the same for us; note also fallback support for
dnl older autoconf in SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY_RELOAD way below:
AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test x"${ac_cv_func_clock_gettime}" = "xyes"])
AM_CONDITIONAL([HAVE_CLOCK_MONOTONIC], [test x"${ac_cv_func_clock_gettime}" = "xyes"])

AC_CACHE_CHECK([for strnlen(s1,s2,tm)],
    [ac_cv_func_strnlen],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL
#include <stdlib.h>
],
            [size_t len = strnlen("LongString", 5);
if (len != 5) return 5;

len = strnlen("LongString", 50);
if (len != 10) return 10
])],
        [ac_cv_func_strnlen=yes], [ac_cv_func_strnlen=no]
    )])
AS_IF([test x"${ac_cv_func_strnlen}" = xyes],
    [AC_DEFINE([HAVE_STRNLEN], 1, [defined if standard library has, and C standard allows, the strnlen(s1,s2) method])],
    [AC_MSG_WARN([Optional C library routine strnlen not found; a fallback implementation will be built in])]
    )
AM_CONDITIONAL([HAVE_STRNLEN], [test x"${ac_cv_func_strnlen}" = "xyes"])

AC_CACHE_CHECK([for strdup(s)],
    [ac_cv_func_strdup],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL
#include <stdlib.h>
],
            [[int res = 0;
char *t = "Test";
char *s = strdup(t);
if (!s || !(
        s[0]=='T' &&
        s[1]=='e' &&
        s[2]=='s' &&
        s[3]=='t' &&
        s[4]=='\0'
    ) || s == t) res = 1;
if (s) free (s);
if (res != 0) return res
/* autoconf adds ";return 0;" */
]])],
        [ac_cv_func_strdup=yes], [ac_cv_func_strdup=no]
    )])
AS_IF([test x"${ac_cv_func_strdup}" = xyes],
    [AC_DEFINE([HAVE_STRDUP], 1, [defined if standard library has, and C standard allows, the strdup(s) method])],
    [AC_MSG_WARN([Required C library routine strdup not found; try adding -D_POSIX_C_SOURCE=200112L])]
    )

AC_CACHE_CHECK([for %zu as PRIuSIZE],
    [ac_cv_printfmt_zu],
    [AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([$CODE_STRINGINCL
#include <stdlib.h>
],
            [[size_t n = 123;
char buf[64];
snprintf(buf, sizeof(buf), "%zu", n);
return !strcmp(buf, "123");
]])],
        [ac_cv_printfmt_zu=yes], [ac_cv_printfmt_zu=no]
    )])
AS_IF([test x"${ac_cv_printfmt_zu}" = xyes],
    [AC_DEFINE([HAVE_PRINTF_ZU], 1, [defined if standard library has, and C standard allows, the printf("%zu", size_t) support])],
    [AC_MSG_WARN([Desired C library support for printf("%zu", size_t) not found; try adding -D_POSIX_C_SOURCE=200112L])]
    )

AC_CACHE_CHECK([for va_copy(dest,src)],
  [ac_cv_have_va_copy],
  [
    AX_RUN_OR_LINK_IFELSE(
      [AC_LANG_PROGRAM(
        [[#include <stdarg.h>
          void check_va_copy(const char *fmt, ...) {
            va_list ap1, ap2;
            va_start(ap1, fmt);
            va_copy(ap2, ap1);
            va_end(ap1);
            va_end(ap2);
          }]],
        [[check_va_copy("%s", "test");]])],
      [ac_cv_have_va_copy=yes],
      [ac_cv_have_va_copy=no])
  ])

AS_IF([test x"$ac_cv_have_va_copy" = xyes],
  [AC_DEFINE([HAVE_VA_COPY], [1], [defined if va_copy(dest,src) is available])])

AC_CACHE_CHECK([for __va_copy(dest,src)],
  [ac_cv_have___va_copy],
  [
    AX_RUN_OR_LINK_IFELSE(
      [AC_LANG_PROGRAM(
        [[#include <stdarg.h>
          void check___va_copy(const char *fmt, ...) {
            va_list ap1, ap2;
            va_start(ap1, fmt);
            __va_copy(ap2, ap1);
            va_end(ap1);
            va_end(ap2);
          }]],
        [[check___va_copy("%s", "test");]])],
      [ac_cv_have___va_copy=yes],
      [ac_cv_have___va_copy=no])
  ])

AS_IF([test x"$ac_cv_have___va_copy" = xyes],
  [AC_DEFINE([HAVE___VA_COPY], [1], [defined if __va_copy(dest,src) is available])])

AS_IF([test x"$ac_cv_have_va_copy" = xyes -o x"$ac_cv_have___va_copy" = xyes],
  [AC_DEFINE([HAVE_VA_COPY_VARIANT], [1], [defined if va_copy or __va_copy is available])])

AS_IF([test x"$ac_cv_have_va_copy" != xyes -a x"$ac_cv_have___va_copy" != xyes],
  [AC_MSG_WARN([No va_copy(dest,src) or __va_copy(dest,src) available - may truncate oversized logs])])

AC_CHECK_HEADER([sys/select.h],
    [AC_DEFINE([HAVE_SYS_SELECT_H], [1],
        [Define to 1 if you have <sys/select.h>.])])

AC_CHECK_HEADER([unistd.h],
    [AC_DEFINE([HAVE_UNISTD_H], [1],
        [Define to 1 if you have <unistd.h>.])])

AC_CHECK_FUNCS(readlink)

AC_CACHE_CHECK([for suseconds_t],
    [ac_cv_type_suseconds_t],
    [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM([[#include <sys/types.h>
#if HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
        ]],
            [[suseconds_t us = 1000000;
              signed long int l = 1000000;
              if (l != (signed long int)us) return 1;

              l = -1; us = -1;
              if (l != (signed long int)us) return 1
/* autoconf adds ";return 0;" */
/* we hope the code above fails if type is not defined or range is not sufficient */
]])],
        [ac_cv_type_suseconds_t=yes], [ac_cv_type_suseconds_t=no]
    )])
AS_IF([test x"${ac_cv_type_suseconds_t}" = xyes],
    [AC_DEFINE([HAVE_SUSECONDS_T], 1, [defined if standard library has, and C standard allows, the suseconds_t type])],
    [AC_MSG_WARN([Required C library type suseconds_t not found; try adding -D_POSIX_C_SOURCE=200112L])]
    )

AC_CACHE_CHECK([for useconds_t],
    [ac_cv_type_useconds_t],
    [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM([[#include <unistd.h>
        ]],
            [[useconds_t us = 1000000;
              unsigned long int l = 1000000;
              if (l != (unsigned long int)us) return 1
/* autoconf adds ";return 0;" */
/* we hope the code above fails if type is not defined or range is not sufficient */
]])],
        [ac_cv_type_useconds_t=yes], [ac_cv_type_useconds_t=no]
    )])
AS_IF([test x"${ac_cv_type_useconds_t}" = xyes],
    [AC_DEFINE([HAVE_USECONDS_T], 1, [defined if standard library has, and C standard allows, the useconds_t type])],
    [AC_MSG_WARN([Required C library type useconds_t not found; try adding -D_POSIX_C_SOURCE=200112L])]
    )

AC_CACHE_CHECK([for usleep(us)],
    [ac_cv_func_usleep],
    [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM([[#include <unistd.h>
        ]],
            [[useconds_t us = 1000;
if (usleep(us) != 0) return 1 /* per doc, no errors are returned actually */
/* autoconf adds ";return 0;" */
]])],
        [ac_cv_func_usleep=yes], [ac_cv_func_usleep=no]
    )])
AS_IF([test x"${ac_cv_func_usleep}" = xyes],
    [AC_DEFINE([HAVE_USLEEP], 1, [defined if standard library has, and C standard allows, the usleep(us) method])],
    [AC_MSG_WARN([Required C library routine usleep not found; try adding -D_POSIX_C_SOURCE=200112L])]
    )

dnl OpenBSD (at least) methods to query process info, per
dnl https://github.com/openbsd/src/blob/master/bin/ps/ps.c
dnl https://kaashif.co.uk/2015/06/18/how-to-get-a-list-of-processes-on-openbsd-in-c/
BSDKVMPROCLIBS=""
myLIBS="$LIBS"
LIBS="$LIBS -lkvm"
AC_CACHE_CHECK([for BSD KVM process info libs],
    [ac_cv_lib_bsd_kvm_proc],
    [AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([[
#include <stdio.h>
#include <kvm.h>
#include <limits.h>
#include <sys/param.h>
#include <sys/sysctl.h>
        ]],
            [[
    char errbuf[_POSIX2_LINE_MAX];
    kvm_t *kernel = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf);
    int nentries = 0;
    struct kinfo_proc *kinfo = kvm_getprocs(kernel, KERN_PROC_ALL, 0, sizeof(struct kinfo_proc), &nentries);
    int i;
    for (i = 0; i < nentries; ++i) {
        printf("%s\n", kinfo[i].p_comm);
    }
/* autoconf adds ";return 0;" */
/* we hope the code above fails if type is not defined or range is not sufficient */
]])],
        [ac_cv_lib_bsd_kvm_proc=yes
        BSDKVMPROCLIBS="-lkvm"
        ], [ac_cv_lib_bsd_kvm_proc=no]
    )])
LIBS="$myLIBS"

AS_IF([test x"${ac_cv_lib_bsd_kvm_proc}" = xyes],
    [AC_DEFINE([HAVE_LIB_BSD_KVM_PROC], 1, [defined if we have libs, includes and methods for BSD KVM process info])]
    )

dnl https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/sys/procfs.h#L318
dnl https://github.com/illumos/illumos-gate/blob/master/usr/src/cmd/ps/ps.c
AC_CACHE_CHECK([for Solaris/illumos process info libs],
    [ac_cv_lib_illumos_proc],
    [AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([[
#include <stdio.h>
#include <procfs.h>
        ]],
            [[
    psinfo_t info;
    printf("%s", info.pr_fname)
/* autoconf adds ";return 0;" */
/* we hope the code above fails if type is not defined or range is not sufficient */
]])],
        [ac_cv_lib_illumos_proc=yes
        ], [ac_cv_lib_illumos_proc=no]
    )])
LIBS="$myLIBS"

AS_IF([test x"${ac_cv_lib_illumos_proc}" = xyes],
    [AC_DEFINE([HAVE_LIB_ILLUMOS_PROC], 1, [defined if we have libs, includes and methods for Solaris/illumos process info])]
    )

AC_LANG_POP([C])

dnl These routines' arg types differ in strict C standard mode
dnl from what they use in the modes expected by NUT codebase:
dnl   bind() :     /usr/include/x86_64-linux-gnu/sys/socket.h:123:12: note: expected '__CONST_SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'struct sockaddr *'
dnl   accept() :   /usr/include/x86_64-linux-gnu/sys/socket.h:243:12: note: expected '__SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'struct sockaddr *'
dnl   connect() :  /usr/include/x86_64-linux-gnu/sys/socket.h:137:12: note: expected '__CONST_SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'const struct sockaddr *'
dnl   sendto() :   /usr/include/x86_64-linux-gnu/sys/socket.h:163:16: note: expected '__CONST_SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'struct sockaddr *'
dnl   recvfrom() : /usr/include/x86_64-linux-gnu/bits/socket2.h:64:1: note: expected '__SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'struct sockaddr *'

AC_MSG_CHECKING([whether ln -sr works])
dnl We need to relative-symlink some files. Or hardlink. Or copy...
LN_S_R="cp -pR"
if test "$as_ln_s" = "ln -s" ; then
    _abs_srcdir="`cd \"${srcdir}\" && pwd`" || _abs_srcdir=""
    _abs_builddir="`pwd`"
    AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
        AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) srcdir='${srcdir}' _abs_srcdir='${_abs_srcdir}' _abs_builddir='${_abs_builddir}'])
    ])
    if test x"${_abs_srcdir}" = x"${_abs_builddir}" ; then
        LN_S_R="ln"
    else
        dnl NOTE: Here we check equality of the file systems by the
        dnl devices they are mounted from (first column in df output):
        _fs_srcdir="`df \"${_abs_srcdir}\" | tail -1 | awk '{print $1}'`" || fs_srcdir="XXXs"
        _fs_builddir="`df \"${_abs_builddir}\" | tail -1 | awk '{print $1}'`" || fs_builddir="XXXb"
        AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
            AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) _fs_srcdir='${_fs_srcdir}' _fs_builddir='${_fs_builddir}'])
        ])
        if test x"${_fs_srcdir}" = x"${_fs_builddir}" ; then
            LN_S_R="ln"
        else
            dnl Source and build areas are in different filesystems,
            dnl can not hardlink - keep copying approach in place
            AC_MSG_NOTICE([Source and build areas are in different filesystems, or we could not detect this for sure - avoiding hardlinks])
        fi
        unset _fs_srcdir _fs_builddir
    fi
    unset _abs_srcdir _abs_builddir

    dnl Explore GNU ln (or compatible) with relative symlink support
    DIR1="$(${MKTEMP} -d "dir1.XXXXXXX")" && \
    DIR2="$(${MKTEMP} -d "dir2.XXXXXXX")" && \
    touch "${DIR1}/a" && \
    $as_ln_s -r "${DIR1}/a" "${DIR2}/b" && \
    ls -la "${DIR2}/b" | ${GREP} '\.\./' > /dev/null && \
    LN_S_R="$as_ln_s -r"

    rm -rf "${DIR1}" "${DIR2}"
fi
AC_SUBST([LN_S_R], [${LN_S_R}])
if test "$LN_S_R" = "ln -s -r" ; then
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no, using $LN_S_R])
fi

dnl the following may add stuff to LIBOBJS (is this still needed?)
AC_CHECK_FUNCS(vsnprintf snprintf, [], [
	AC_LIBOBJ(snprintf)
	AC_TYPE_LONG_DOUBLE
	AC_TYPE_LONG_LONG_INT
])

AC_REPLACE_FUNCS(setenv unsetenv strerror atexit)

case ${target_os} in
   solaris2* )
      dnl On Solaris, this allows errno to use thread local storage
      CFLAGS="${CFLAGS} -D_REENTRANT"
      ;;
   aix* )
      dnl On AIX, this allows errno to use thread local storage
      CFLAGS="${CFLAGS} -D_REENTRANT"
      ;;
   hpux11* )
      dnl It seems like the thread safe string functions will not be included
      dnl on 64 bit HP-UX unless we define _REENTRANT
      CFLAGS="${CFLAGS} -D_REENTRANT"
      ;;
esac

dnl optind handling:
dnl need to check if unistd.h is enough, else try getopt.h, else need decls
AC_CHECK_DECLS(optind, [], [
	AC_CHECK_HEADERS(getopt.h, [
		AC_DEFINE(NEED_GETOPT_H, 1, [Define if getopt.h is needed])
	], [
		AC_DEFINE(NEED_GETOPT_DECLS, 1, [Define to use explicit getopt declarations])
	], [AC_INCLUDES_DEFAULT])
], [AC_INCLUDES_DEFAULT])

dnl do a 2nd check to ensure inclusion of getopt.h, in case optind is known
AC_CHECK_HEADERS(getopt.h, [
	AC_DEFINE(NEED_GETOPT_H, 1, [Define if getopt.h is needed])
], [
	AC_DEFINE(NEED_GETOPT_DECLS, 1, [Define to use explicit getopt declarations])
], [AC_INCLUDES_DEFAULT])

dnl also check for getopt_long
AC_CHECK_FUNCS(getopt_long)

dnl FreeBSD serial locking compatibility - look for uu_lock in libutil.h
AC_CHECK_DECLS(uu_lock, [
	AC_DEFINE(HAVE_UU_LOCK, 1, [Use uu_lock for locking (FreeBSD)])
	SERLIBS="-lutil"
	dnl put in some better defaults for FreeBSD
	RUN_AS_USER="uucp"
], [
	SERLIBS=""
], [
#include <sys/types.h>
#include <libutil.h>
])

AC_CHECK_DECLS(__func__, [], [
	AC_CHECK_DECLS(__FUNCTION__, [
		AC_DEFINE(__func__, __FUNCTION__, [Replace missing __func__ declaration])
	], [
		AC_DEFINE(__func__, __LINE__, [Replace missing  __func__ declaration])
	], [AC_INCLUDES_DEFAULT])
], [AC_INCLUDES_DEFAULT])

dnl Solaris compatibility - check for -lnsl and -lsocket
AC_SEARCH_LIBS(gethostbyname, nsl)
AC_SEARCH_LIBS(connect, socket)

AC_CHECK_HEADERS(sys/modem.h stdarg.h varargs.h, [], [], [AC_INCLUDES_DEFAULT])


dnl pthread related checks
dnl Note: pthread_tryjoin_np() should be available since glibc 2.3.3, according
dnl to https://man7.org/linux/man-pages/man3/pthread_tryjoin_np.3.html
AC_SEARCH_LIBS([pthread_create], [pthread],
       [AC_DEFINE(HAVE_PTHREAD, 1, [Define to enable pthread support code])
        AC_SEARCH_LIBS([pthread_tryjoin_np], [pthread],
               [AC_DEFINE(HAVE_PTHREAD_TRYJOIN, 1, [Define to enable pthread_tryjoin support code])],
               [])
       ],
       [])

dnl ----------------------------------------------------------------------
dnl Check for types and define possible replacements
NUT_TYPE_SOCKLEN_T
NUT_CHECK_SOCKETLIB
NUT_FUNC_GETNAMEINFO_ARGTYPES

AC_CACHE_CHECK([for inet_ntop() with IPv4 and IPv6 support],
    [ac_cv_func_inet_ntop],
    [AC_LANG_PUSH([C])
    dnl e.g. add "-lws2_32" for mingw builds
    dnl the NETLIBS are set by NUT_CHECK_SOCKETLIB above
    SAVED_LIBS="$LIBS"
    LIBS="$LIBS $NETLIBS"
    AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([[
#if HAVE_WINDOWS_H
# undef inline
# ifndef WIN32_LEAN_AND_MEAN
#  define WIN32_LEAN_AND_MEAN
# endif
# include <windows.h>
# if HAVE_WINSOCK2_H
#  include <winsock2.h>
# endif
# if HAVE_WS2TCPIP_H
#  include <ws2tcpip.h>
# endif
#else
# include <arpa/inet.h>
#endif
#include <stdio.h>
]],
            [[/* const char* inet_ntop(int af, const void* src, char* dst, size_t cnt); */
char buf[128];
printf("%s", inet_ntop(AF_INET, "1.2.3.4", buf, 10));
printf("%s", inet_ntop(AF_INET6, "::1", buf, 10))
/* autoconf adds ";return 0;" */
]])],
        [ac_cv_func_inet_ntop=yes], [ac_cv_func_inet_ntop=no]
    )
    AC_LANG_POP([C])
    LIBS="$SAVED_LIBS"
])
AS_IF([test x"${ac_cv_func_inet_ntop}" = xyes],
    [AC_DEFINE([HAVE_INET_NTOP], 1, [defined if system has the inet_ntop() method])],
    [AC_MSG_WARN([Required C library routine inet_ntop() not found])
     AS_CASE([${target_os}],
         [*mingw*], [AC_MSG_WARN([Windows antivirus might block this test])]
         )
    ]
    )

AC_CACHE_CHECK([for inet_pton() with IPv4 and IPv6 support],
    [ac_cv_func_inet_pton],
    [AC_LANG_PUSH([C])
    dnl e.g. add "-lws2_32" for mingw builds
    dnl the NETLIBS are set by NUT_CHECK_SOCKETLIB above
    SAVED_LIBS="$LIBS"
    LIBS="$LIBS $NETLIBS"
    AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([[
#if HAVE_WINDOWS_H
# undef inline
# ifndef WIN32_LEAN_AND_MEAN
#  define WIN32_LEAN_AND_MEAN
# endif
# include <windows.h>
# if HAVE_WINSOCK2_H
#  include <winsock2.h>
# endif
# if HAVE_WS2TCPIP_H
#  include <ws2tcpip.h>
# endif
#else
# include <arpa/inet.h>
#endif
#include <stdio.h>
]],
            [[/* int inet_pton(int af, const char *src, char *dst); */
struct in_addr  ipv4;
struct in6_addr ipv6;
printf("%i ", inet_pton(AF_INET, "1.2.3.4", &ipv4));
printf("%i ", inet_pton(AF_INET6, "::1", &ipv6))
/* autoconf adds ";return 0;" */
]])],
        [ac_cv_func_inet_pton=yes], [ac_cv_func_inet_pton=no]
    )
    AC_LANG_POP([C])
    LIBS="$SAVED_LIBS"
])
AS_IF([test x"${ac_cv_func_inet_pton}" = xyes],
    [AC_DEFINE([HAVE_INET_PTON], 1, [defined if system has the inet_pton() method])],
    [AC_MSG_WARN([Required C library routine inet_pton() not found])
     AS_CASE([${target_os}],
         [*mingw*], [AC_MSG_WARN([Windows antivirus might block this test])]
         )
    ]
    )

AC_CACHE_CHECK([for struct pollfd],
    [ac_cv_struct_pollfd],
    [AC_LANG_PUSH([C])
    dnl e.g. add "-lws2_32" for mingw builds
    dnl the NETLIBS are set by NUT_CHECK_SOCKETLIB above
    SAVED_LIBS="$LIBS"
    LIBS="$LIBS $NETLIBS"
    AX_RUN_OR_LINK_IFELSE(
        [AC_LANG_PROGRAM([[
#if HAVE_WINDOWS_H
# undef inline
# ifndef WIN32_LEAN_AND_MEAN
#  define WIN32_LEAN_AND_MEAN
# endif
# include <windows.h>
# if HAVE_WINSOCK2_H
#  include <winsock2.h>
# endif
# if HAVE_WS2TCPIP_H
#  include <ws2tcpip.h>
# endif
#else
# include <poll.h>
#endif
#include <stdio.h>
]],
            [[
struct pollfd  pfd;
pfd.fd = 0;
/* autoconf adds ";return 0;" */
]])],
        [ac_cv_struct_pollfd=yes], [ac_cv_struct_pollfd=no]
    )
    AC_LANG_POP([C])
    LIBS="$SAVED_LIBS"
])
AS_IF([test x"${ac_cv_struct_pollfd}" = xyes],
    [AC_DEFINE([HAVE_STRUCT_POLLFD], 1, [defined if system has the struct pollfd type])],
    [AC_MSG_WARN([Required C library type struct pollfd not found])
     AS_CASE([${target_os}],
         [*mingw*], [AC_MSG_WARN([Windows antivirus might block this test])]
         )
    ]
    )

NETLIBS_GETADDRS=""
dnl For `nut-scanner -m auto` modes, see also:
dnl https://stackoverflow.com/a/41151132/4715872
dnl https://learn.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getadaptersaddresses (since ~Windows Vista)
dnl https://learn.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getadaptersinfo (before Windows XP; not recommended later)
dnl Must check in global context, to have it not-defined where appropriate too
NUT_CHECK_HEADER_IPHLPAPI
AC_CHECK_HEADERS_ONCE([ifaddrs.h netinet/in.h net/if.h])
AC_CHECK_FUNCS([getifaddrs], [], [
    AS_CASE([${target_os}],
        [*mingw*], [
            dnl Check for GetAdaptersAddresses / GetAdaptersInfo
            AS_IF([test x"${nut_cv_header_iphlpapi_h}" = xyes], [

                myIPHLPAPI_TEST_HEADERS='
#if HAVE_WINDOWS_H
# undef inline
# ifndef WIN32_LEAN_AND_MEAN
#  define WIN32_LEAN_AND_MEAN
# endif
# include <windows.h>
# if HAVE_WINSOCK2_H
#  include <winsock2.h>
# endif
# if HAVE_IPHLPAPI_H
#  include <iphlpapi.h>
# endif
#endif
#include <stdio.h>
'

                myIPHLPAPI_TEST_GAA='
/* ULONG GetAdaptersAddresses(ULONG af, ULONG flags, void* rsvd, PIP_ADAPTER_ADDRESSES addrs, PULONG sizeptr); */
IP_ADAPTER_ADDRESSES buf@<:@8@:>@;
ULONG bufsz = sizeof(buf);
printf("%ld ", GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_SKIP_MULTICAST, NULL, buf, &bufsz));
printf("%ld ", GetAdaptersAddresses(AF_INET, GAA_FLAG_SKIP_DNS_SERVER, NULL, buf, &bufsz));
printf("%ld ", GetAdaptersAddresses(AF_INET6, GAA_FLAG_SKIP_ANYCAST, NULL, buf, &bufsz))
/* autoconf adds ";return 0;" */
'

                AC_CACHE_CHECK([for GetAdaptersAddresses() with IPv4 and IPv6 support],
                    [ac_cv_func_GetAdaptersAddresses],
                    [AC_LANG_PUSH([C])
                    dnl e.g. add "-lws2_32" for mingw builds, maybe "-liphlpapi"
                    dnl the NETLIBS are set by NUT_CHECK_SOCKETLIB above
                    SAVED_LIBS="$LIBS"
                    LIBS="$LIBS $NETLIBS"
                    AX_RUN_OR_LINK_IFELSE(
                        [AC_LANG_PROGRAM(
                            [${myIPHLPAPI_TEST_HEADERS}],
                            [${myIPHLPAPI_TEST_GAA}])],
                        [ac_cv_func_GetAdaptersAddresses=yes
                        ], [
                            NETLIBS_GETADDRS="-liphlpapi"
                            LIBS="$LIBS $NETLIBS $NETLIBS_GETADDRS"
                            AX_RUN_OR_LINK_IFELSE(
                                [AC_LANG_PROGRAM(
                                    [${myIPHLPAPI_TEST_HEADERS}],
                                    [${myIPHLPAPI_TEST_GAA}])],
                                [
                                    ac_cv_func_GetAdaptersAddresses=yes
                                ], [
                                    ac_cv_func_GetAdaptersAddresses=no
                                    NETLIBS_GETADDRS=""
                                ]
                            )
                        ]
                    )
                    AC_LANG_POP([C])
                    LIBS="$SAVED_LIBS"
                ])
                AS_IF([test x"${ac_cv_func_GetAdaptersAddresses}" = xyes],
                    [AC_DEFINE([HAVE_GETADAPTERSADDRESSES], 1, [defined if system has the GetAdaptersAddresses() method])],
                    [
                     AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
                        AC_MSG_WARN([WIN32 library routine GetAdaptersAddresses() not found])
                     ])
                     AS_CASE([${target_os}],
                         [*mingw*], [AC_MSG_WARN([Windows antivirus might block this test])]
                         )
                    ]
                    )

                myIPHLPAPI_TEST_GAI='
/* ULONG GetAdaptersInfo(PIP_ADAPTER_INFO addrs, PULONG sizeptr); */
IP_ADAPTER_INFO buf@<:@8@:>@;
ULONG bufsz = sizeof(buf);
printf("%ld ", GetAdaptersInfo(buf, &bufsz))
/* autoconf adds ";return 0;" */
'

                AC_CACHE_CHECK([for GetAdaptersInfo() with IPv4 only support],
                    [ac_cv_func_GetAdaptersInfo],
                    [AC_LANG_PUSH([C])
                    dnl e.g. add "-lws2_32" for mingw builds
                    dnl the NETLIBS are set by NUT_CHECK_SOCKETLIB above
                    SAVED_LIBS="$LIBS"
                    LIBS="$LIBS $NETLIBS $NETLIBS_GETADDRS"
                    AX_RUN_OR_LINK_IFELSE(
                        [AC_LANG_PROGRAM(
                            [${myIPHLPAPI_TEST_HEADERS}],
                            [${myIPHLPAPI_TEST_GAI}])],
                        [ac_cv_func_GetAdaptersInfo=yes
                        ], [
                            NETLIBS_GETADDRS="-liphlpapi"
                            LIBS="$LIBS $NETLIBS $NETLIBS_GETADDRS"
                            AX_RUN_OR_LINK_IFELSE(
                                [AC_LANG_PROGRAM(
                                    [${myIPHLPAPI_TEST_HEADERS}],
                                    [${myIPHLPAPI_TEST_GAI}])],
                                [
                                    ac_cv_func_GetAdaptersInfo=yes
                                ], [
                                    ac_cv_func_GetAdaptersInfo=no
                                    NETLIBS_GETADDRS=""
                                ]
                            )
                        ]
                    )
                    AC_LANG_POP([C])
                    LIBS="$SAVED_LIBS"
                ])
                AS_IF([test x"${ac_cv_func_GetAdaptersInfo}" = xyes],
                    [AC_DEFINE([HAVE_GETADAPTERSINFO], 1, [defined if system has the GetAdaptersInfo() method])],
                    [
                     AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
                         AC_MSG_WARN([WIN32 library routine GetAdaptersInfo() not found])
                     ])
                     AS_CASE([${target_os}],
                         [*mingw*], [AC_MSG_WARN([Windows antivirus might block this test])]
                         )
                    ]
                    )

            ])
            ]
    )]
)
AC_SUBST([NETLIBS_GETADDRS])


dnl ----------------------------------------------------------------------
dnl First remember if caller wants a custom Python package location?
NUT_ARG_WITH([python-modules-dir], [install the PyNUT module files under specified path for default Python interpreter (auto for its reported site-packages location, if not with UI app)], [auto])
NUT_ARG_WITH([python2-modules-dir], [install the PyNUT module files under specified path for Python2 interpreter (auto for its reported site-packages location, if not with UI app)], [auto])
NUT_ARG_WITH([python3-modules-dir], [install the PyNUT module files under specified path for Python3 interpreter (auto for its reported site-packages location, if not with UI app)], [auto])
dnl Check for Python binary program names per language version
dnl to embed into scripts and Make rules
NUT_CHECK_PYTHON_DEFAULT

dnl ----------------------------------------------------------------------
dnl Check for "require Modbus with USB support" situation before we mangle
dnl caller-provided with_* values below (by --with-drivers and --with-all)

nut_with_modbus_and_usb=auto
AC_ARG_WITH(modbus+usb,
	AS_HELP_STRING([--with-modbus+usb],
	[Require Modbus with USB support (auto)]),
[
	case "${withval}" in
	no)
		dnl # AC_MSG_ERROR(invalid option --without-modbus+usb - see docs/configure.txt)
		AC_MSG_NOTICE([Treating --without-modbus+usb as not-requiring that used libmodbus supports RTU USB])
		nut_with_modbus_and_usb="no"
		;;
	auto)
		nut_with_modbus_and_usb="auto"
		;;
	yes|'')
		if test -z "${with_usb}"; then with_usb="${withval}"; fi
		if test -z "${with_modbus}"; then with_modbus="${withval}"; fi
		nut_with_modbus_and_usb="yes"
		;;
	*)
		AC_MSG_ERROR(invalid option --with-modbus+usb='${withval}' - see docs/configure.txt)
		;;
	esac
], [
	dnl Explicit request to build apc_modbus with both modbus and usb
	dnl support specified on command line implies we want them present
	dnl together too by default
	dnl FIXME: Extend to --with-drivers=all or that would not be
	dnl  a least-surprise breakage for packagers?
	case x"${with_drivers}" in
		*apc_modbus*)
			dnl Note: defaulting of with_modbus=yes will be handled
			dnl below by --with-drivers
			if test x"${with_usb}" = xyes ; then
				nut_with_modbus_and_usb="yes"
				AC_MSG_WARN([Treating explicit requests to build apc_modbus and toe libusb as building --with-modbus+usb=yes])
			fi
			;;
		*)
			if test x"${with_usb}" = xyes -a x"${with_modbus}" = xyes \
			     -a x"${with_modbus_includes}" != x -a x"${with_modbus_libs}" != x \
			; then
				nut_with_modbus_and_usb="yes"
				AC_MSG_WARN([Treating explicit requests to build NUT with both modbus (with custom includes and libs) and usb as building --with-modbus+usb=yes])
			fi
			;;
	esac
])


dnl ----------------------------------------------------------------------
dnl check for --with-drivers=all (or --with-drivers=name[,name...]) flag
dnl Note: a few drivers are NUT software constructs (NUTSW_DRIVERLIST)
dnl e.g. dummy-ups, clone and clone-outlet; they do not have a separate
dnl toggle or dependency at the moment. Earlier NUT releases before 2.8.0
dnl grouped them with serial drivers, which were enabled by default.

dnl Autoconf versions before 2.62 do not allow consecutive quadrigraphs
dnl (square brackets), so the help string depends on the version used
AC_MSG_CHECKING(which drivers to build)
AC_ARG_WITH(drivers,
	AS_HELP_STRING([m4_version_prereq(2.62,
		[@<:@--with-drivers=driver@<:@,driver@:>@@:>@],
		[[[[--with-drivers=driver@<:@,driver@:>@]]]])],
	[Only build specific drivers (all)]),
[
	case "${withval}" in
	yes|no|'')
		AC_MSG_ERROR(invalid option --with(out)-drivers - see docs/configure.txt)
		;;
	all)
		dnl Explicit request to build all drivers (unless specified), or fail
		DRIVER_BUILD_LIST="all"
		if test -z "${with_serial}"; then with_serial="yes"; fi
		if test -z "${with_usb}"; then with_usb="yes"; fi
		if test -z "${with_snmp}"; then with_snmp="yes"; fi
		if test -z "${with_neon}"; then with_neon="yes"; fi
		if test -z "${with_powerman}"; then with_powerman="yes"; fi
		if test -z "${with_modbus}"; then with_modbus="yes"; fi
		if test -z "${with_ipmi}"; then with_ipmi="yes"; fi
		if test -z "${with_upower}"; then with_upower="yes"; fi

		dnl Platform-dependent snowflakes that are required or auto:
		if test -z "${with_gpio}"; then
			dnl NOTE: Currently we only support a Linux libgpiod
			dnl backend for GPIO; eventually there could be more.
			dnl Also note that since March 2023 the very different
			dnl libgpiod v2.x is out (requires kernel 5.17.4+)
			case ${target_os} in
				linux*) with_gpio="auto";; dnl # TODO: Detect 2018+ distros?
				*) with_gpio="auto";;
			esac
		fi
		if test -z "${with_linux_i2c}"; then
			case ${target_os} in
				linux*) with_linux_i2c="yes";;
				*) with_linux_i2c="auto";;
			esac
		fi
		if test -z "${with_macosx_ups}"; then
			if test -d /System/Library/Frameworks/IOKit.framework/ ; then
				with_macosx_ups="yes"
			else
				with_macosx_ups="auto"
			fi
		fi
		AC_MSG_RESULT(${DRIVER_BUILD_LIST})
		;;
	auto)
		dnl Explicit request to build all drivers that we can
		DRIVER_BUILD_LIST="all"
		if test -z "${with_serial}"; then with_serial="${withval}"; fi
		if test -z "${with_usb}"; then with_usb="${withval}"; fi
		if test -z "${with_snmp}"; then with_snmp="${withval}"; fi
		if test -z "${with_neon}"; then with_neon="${withval}"; fi
		if test -z "${with_powerman}"; then with_powerman="${withval}"; fi
		if test -z "${with_modbus}"; then with_modbus="${withval}"; fi
		if test -z "${with_ipmi}"; then with_ipmi="${withval}"; fi
		if test -z "${with_upower}"; then with_upower="${withval}"; fi
		if test -z "${with_gpio}"; then with_gpio="${withval}"; fi
		if test -z "${with_linux_i2c}"; then with_linux_i2c="${withval}"; fi
		if test -z "${with_macosx_ups}"; then with_macosx_ups="${withval}"; fi
		AC_MSG_RESULT(${DRIVER_BUILD_LIST})
		;;
	*)
		DRIVER_BUILD_LIST="`echo ${withval} | sed 's/,/ /g'`"
		AC_MSG_RESULT(${DRIVER_BUILD_LIST})

		AS_IF([test -n "$DRIVER_BUILD_LIST"],
			[dnl DRVLIST is occasionally synced with drivers/Makefile.am
			 dnl NOTE: Currently "USB_DRIVERLIST" is not used standalone:
			DRVLIST_NAMES="NUTSW_DRIVERLIST
				SERIAL_DRIVERLIST USB_LIBUSB_DRIVERLIST SERIAL_USB_DRIVERLIST
				SNMP_DRIVERLIST NEONXML_DRIVERLIST
				MACOSX_DRIVERLIST MODBUS_DRIVERLIST LINUX_I2C_DRIVERLIST
				POWERMAN_DRIVERLIST IPMI_DRIVERLIST GPIO_DRIVERLIST
				UPOWER_DRIVERLIST"

			dnl Gets ONE Makefile assignment value
			get_drivers_makefile_value() (
				dnl Note escaped brackets - "against" m4 parser
				m4_version_prereq(2.62,
					[LB="@<:@"; RB="@:>@"],
					[LB="[["; RB="]]"]
				)
				dnl ###DEBUG### echo "RECURSIVE SEARCH FOR: '$1'" >&2
				SPACE="`printf \"$LB\"' \t'\"$RB\"`"
				SPACES="${SPACE}*"
				sed -e "s/${SPACES}""$LB"'+'"$RB"'*='"${SPACES}/=/" \
				    -e "s/^${SPACES}//" < "$srcdir/drivers/Makefile.am" \
				| (
					C=false; V=false
					while read LINE ; do
						case "$LINE" in
							*'\') C=true; if $V ; then echo "$LINE" ; fi ;;
							*) if $C ; then exit 0; fi ; C=false; V=false ;;
						esac
						case "$LINE" in
							"$1"=*)
								echo "$LINE" | sed -e 's,^'"$LB"'^='"$RB"'*=,,'
								V=$C
								;;
						esac
					done
					echo ""
				) | tr '\n' ' ' | sed -e 's,\$(EXEEXT),,g' \
				| tr ' ' '\n' | while read TOKEN ; do
					case x"${TOKEN}" in
						x)	;;
						'x$('*')') get_drivers_makefile_value "`echo \"${TOKEN}\" | sed -e 's,^\$(,,' -e 's,)$,,'`" ;;
						'x${'*'}') get_drivers_makefile_value "`echo \"${TOKEN}\" | sed -e 's,^\${,,' -e 's,}$,,'`" ;;
						*)	echo "${TOKEN} " ;;
					esac
				done dnl ###DEBUG### | tee -a /dev/stderr
			)

			get_drvlist() (
				m4_version_prereq(2.62,
					[LB="@<:@"; RB="@:>@"],
					[LB="[["; RB="]]"]
				)
				dnl ###DEBUG### echo "SEARCH FOR: '$1'" >&2
				SPACE="`printf \"$LB\"' \t'\"$RB\"`"
				SPACES="${SPACE}*"

				dnl Let it recurse, and only then we collect the
				dnl result into one string with reduced spaces:
				get_drivers_makefile_value "$1" \
				| tr '\n' ' ' | sed -e "s,${SPACE}${SPACES}, ,g" -e "s,${SPACES}\$,,"
			)

			for DRVLIST_NAME in $DRVLIST_NAMES; do
				OUT="`get_drvlist \"$DRVLIST_NAME\"`" \
				&& test -n "$OUT" || OUT=""
				eval $DRVLIST_NAME="\$OUT"
				AC_MSG_NOTICE([Will check custom driver selection against $DRVLIST_NAME="$OUT"])
			done

			dnl Note: do not quote the expansion below to keep it multi-token:
			for DRV in $DRIVER_BUILD_LIST ; do

				DRV_HITS=""
				AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
					AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) = Checking DRV="$DRV"])
				])
				for DRVLIST_NAME in $DRVLIST_NAMES; do
					AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
						AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) == Checking DRVLIST_NAME="$DRVLIST_NAME"])
					])
					eval DRVLIST="\${$DRVLIST_NAME}"
					AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
						AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) == Contents DRVLIST="$DRVLIST"])
					])

					for DN in $DRVLIST ; do
						AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
							AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) === Checking DN="$DN"])
						])
						AS_IF([test x"$DN" = x"$DRV"], [
							DRV_HITS="$DRV_HITS $DRVLIST_NAME"
							AS_CASE(["$DRVLIST_NAME"],

								[NUTSW_DRIVERLIST], [
									AC_MSG_NOTICE([Building NUT-Software-only driver "$DRV"])
									],
								[SERIAL_DRIVERLIST], [
									AS_IF([test -z "${with_serial}"],
										[AC_MSG_NOTICE([Requiring --with-serial=yes for driver "$DRV"])
										with_serial=yes]
									)],
								[USB_LIBUSB_DRIVERLIST], [
									AS_IF([test -z "${with_usb}"],
										[AC_MSG_NOTICE([Requiring --with-usb=yes for driver "$DRV"])
										with_usb=yes]
									)],
								[SERIAL_USB_DRIVERLIST], [
									dnl e.g. nutdrv_qx that can do both
									AS_IF([test -z "${with_usb}"],
										[AC_MSG_NOTICE([Requiring --with-usb=yes for driver "$DRV"])
										with_usb=yes]
									)
									AS_IF([test -z "${with_serial}"],
										[AC_MSG_NOTICE([Requiring --with-serial=yes for driver "$DRV"])
										with_serial=yes]
									)],
								[SNMP_DRIVERLIST], [
									AS_IF([test -z "${with_snmp}"],
										[AC_MSG_NOTICE([Requiring --with-snmp=yes for driver "$DRV"])
										with_snmp=yes]
									)],
								[NEONXML_DRIVERLIST], [
									AS_IF([test -z "${with_neon}"],
										[AC_MSG_NOTICE([Requiring --with-neon=yes for driver "$DRV"])
										with_neon=yes]
									)],
								[MACOSX_DRIVERLIST], [
									dnl NOTE: This one is a bit special,
									dnl just one certain driver so far
									AS_IF([test -z "${with_macosx_ups}"],
										[AC_MSG_NOTICE([Requiring --with-macosx-ups=yes for driver "$DRV"])
										with_macosx_ups=yes]
									)],
								[MODBUS_DRIVERLIST], [
									AS_IF([test -z "${with_modbus}"],
										[AC_MSG_NOTICE([Requiring --with-modbus=yes for driver "$DRV"])
										with_modbus=yes]
									)],
								[LINUX_I2C_DRIVERLIST], [
									AS_IF([test -z "${with_linux_i2c}"],
										[AC_MSG_NOTICE([Requiring --with-linux-i2c=yes for driver "$DRV"])
										with_linux_i2c=yes]
									)],
								[POWERMAN_DRIVERLIST], [
									AS_IF([test -z "${with_powerman}"],
										[AC_MSG_NOTICE([Requiring --with-powerman=yes for driver "$DRV"])
										with_powerman=yes]
									)],
								[IPMI_DRIVERLIST], [
									AS_IF([test -z "${with_ipmi}"],
										[AC_MSG_NOTICE([Requiring --with-ipmi=yes for driver "$DRV"])
										with_ipmi=yes]
									)],
								[GPIO_DRIVERLIST], [
									AS_IF([test -z "${with_gpio}"],
										[AC_MSG_NOTICE([Requiring --with-gpio=yes for driver "$DRV"])
										with_gpio=yes]
									)],
								[UPOWER_DRIVERLIST], [
									AS_IF([test -z "${with_upower}"],
										[AC_MSG_NOTICE([Requiring --with-upower=yes for driver "$DRV"])
										with_upower=yes]
									)],

								[AC_MSG_WARN([Unhandled DRVLIST_NAME=$DRVLIST_NAME])]
							)
							break
							dnl Break once, maybe a driver hits several categories
						])
					done
				done
				AS_IF([test -z "${DRV_HITS}"],
					[AC_MSG_ERROR([Requested driver '$DRV' is not defined in drivers/Makefile.am (or configure.ac has a bug/lag detecting driver lists)])])

			done
			])

		;;
	esac
], [
	dnl Implicit request to build whatever is enabled;
	dnl do not force --with-all here:
	DRIVER_BUILD_LIST="all"
	AC_MSG_RESULT(all available)
])
AM_CONDITIONAL(SOME_DRIVERS, test "${DRIVER_BUILD_LIST}" != "all")

if test "${DRIVER_BUILD_LIST}" != "all"; then
	NUT_REPORT([only build specific drivers], [${DRIVER_BUILD_LIST}])
fi

dnl ----------------------------------------------------------------------
dnl check for --with-all (or --without-all, or --with-all=auto) flag

AC_MSG_CHECKING(for --with-all)
AC_ARG_WITH(all,
	AS_HELP_STRING([--with-all], [enable serial, usb, snmp, neon, ipmi, powerman, modbus, gpio (currently on Linux released after ~2018), linux_i2c (on Linux), upower, macosx-ups (on MacOS), cgi, dev, avahi, nut-scanner, nutconf, dev-libnutconf, pynut]),
[
	if test -n "${withval}"; then
		dnl Note: we allow "no" as a positive value, because
		dnl this is what the user expects from --without-all
		dnl Note: these settings do not touch generation of
		dnl "--with-docs=...", that is handled separately
		if test -z "${with_serial}"; then with_serial="${withval}"; fi
		if test -z "${with_usb}"; then with_usb="${withval}"; fi
		if test -z "${with_snmp}"; then with_snmp="${withval}"; fi
		if test -z "${with_neon}"; then with_neon="${withval}"; fi
		if test -z "${with_powerman}"; then with_powerman="${withval}"; fi
		if test -z "${with_modbus}"; then with_modbus="${withval}"; fi
		if test -z "${with_ipmi}"; then with_ipmi="${withval}"; fi
		if test -z "${with_upower}"; then with_upower="${withval}"; fi

		dnl Platform-dependent snowflakes that are required or auto:
		if test -z "${with_gpio}"; then
			dnl NOTE: Currently we only support a Linux libgpiod
			dnl backend for GPIO; eventually there could be more.
			dnl Also note that since March 2023 the very different
			dnl libgpiod v2.x is out (requires kernel 5.17.4+)
			with_gpio="${withval}"
			case ${target_os} in
				linux*) ;;
				*) test x"${withval}" = xno || with_gpio="auto" ;;
			esac
		fi
		if test -z "${with_linux_i2c}"; then
			with_linux_i2c="${withval}"
			case ${target_os} in
				linux*) ;;
				*) test x"${withval}" = xno || with_linux_i2c="auto" ;;
			esac
		fi
		if test -z "${with_macosx_ups}"; then
			with_macosx_ups="${withval}"
			if test ! -d /System/Library/Frameworks/IOKit.framework/ ; then
				test x"${withval}" = xno || with_macosx_ups="auto"
			fi
		fi

		dnl These are not driver families, but other features:
		if test -z "${with_cgi}"; then with_cgi="${withval}"; fi
		if test -z "${with_dev}"; then with_dev="${withval}"; fi
		if test -z "${with_avahi}"; then with_avahi="${withval}"; fi
		if test -z "${with_nut_scanner}"; then with_nut_scanner="${withval}"; fi
		if test -z "${with_nutconf}"; then with_nutconf="${withval}"; fi

		dnl dev-libnutconf is experimental, and relies on
		dnl functional C++11 that we only check for later;
		dnl at best, we can follow main nutconf request
		dnl (explicit from caller, or set a few lines above)
		if test -z "${with_dev_libnutconf}" ; then
			if test "${withval}" = no ; then
				with_dev_libnutconf="no"
			else
				case "${with_dev}${with_nutconf}" in
					*no*) with_dev_libnutconf="no" ;;
					*auto*) with_dev_libnutconf="auto" ;;
					yesyes) with_dev_libnutconf="yes" ;;
				esac
			fi
		fi

		if test -n "${PYTHON}${PYTHON2}${PYTHON3}" -a x"${withval}" = xyes \
		|| test x"${withval}" != xyes \
		; then
			dnl We expect Python to be available (augeas etc),
			dnl so if it is present - try to provide the PyNUT
			dnl binding module:
			if test -z "${with_pynut}"; then with_pynut="${withval}"; fi

			dnl However, do not let "--with-all" break builds
			dnl on servers that lack some GUI modules in their
			dnl Python installations; "auto" is defaulted below.
			dnl # if test -z "${with_nut_monitor}"; then with_nut_monitor="${withval}"; fi
		fi

		AC_MSG_RESULT([${withval}])
	else
		AC_MSG_RESULT(not given)
	fi
], [
	AC_MSG_RESULT(not given)
])

dnl ----------------------------------------------------------------------
dnl declare a number of --with-FEATURE options. Do this early, so that
dnl they are listed near the top by "./configure --help"; however,
dnl note that options with further investigation methods are listed
dnl a bit below to be grouped with their additional with/enable help.

dnl Depends on C++ support being available and enabled
NUT_ARG_WITH([nutconf], [build and install the nutconf tool (experimental, has compiler/coverage warnings)], [auto])

NUT_ARG_WITH([dev], [build and install the development files], [no])

dnl Depends on C++ support being available and enabled
dnl Does not depend on nutconf or dev explicitly (but warns about inconsistencies)
NUT_ARG_WITH([dev-libnutconf], [deliver the C++ library behind the nutconf tool and its headers (experimental)], [no])

dnl Activate WITH_UNMAPPED_DATA_POINTS for troubleshooting and evolution?
dnl Note that production drivers must conform to docs/nut-names.txt
NUT_ARG_WITH([unmapped-data-points],
    [represent USB-HID and SNMP data points discovered during subdriver generation but not mapped to nut-names yet],
    [no])
AS_IF([test x"${nut_with_unmapped_data_points}" = xyes],
    [AC_DEFINE(WITH_UNMAPPED_DATA_POINTS, 1,
        [Define to enable data points discovered during subdriver generation but not mapped to nut-names yet])],
    [AC_DEFINE(WITH_UNMAPPED_DATA_POINTS, 0,
        [Define to enable data points discovered during subdriver generation but not mapped to nut-names yet])]
)

dnl The NUT legacy option was --with-doc; however to simplify configuration
dnl in some common packaging frameworks, we also allow --with-docs as
dnl a second-class citizen (if both are set, the old option name wins).
dnl Also note that the legacy default was "man=yes" due to requirements
dnl of the "make distcheck", but it was reduced to "man=auto" so that
dnl the usual builds can pass by default on systems without asciidoc.
m4_define([m4nut_DEFAULT_WITH_DOCS], [man=auto])
nut_with_docs_default="m4nut_DEFAULT_WITH_DOCS"
AS_IF([($NUT_SOURCE_GITREV_IS_RELEASE || $NUT_SOURCE_GITREV_IS_PRERELEASE)],
    [AC_MSG_NOTICE([This is a (pre-)release build, setting default --with-doc='auto' (not just '${nut_with_docs_default}')])
     nut_with_docs_default="auto"])

NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([docs], [(auto|yes|no|man|man=auto|...)], [build and install documentation (alias to legacy --with-doc)], [${nut_with_docs_default}], [varies for development vs. (pre-)release builds, typically ]m4nut_DEFAULT_WITH_DOCS)
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([doc],  [], [build and install documentation (see docs/configure.txt for many variants of the option)], [${nut_with_docs}], [same as ${nut_with_docs}])

NUT_ARG_ENABLE([docs-man-for-progs-built-only], [build and install man pages (if enabled) only for built programs (yes, default) or all known pages (no)], [yes])
NUT_ARG_ENABLE([docs-changelog], [(auto|yes|no|"adoc,html,pdf"...)], [(re-)generate ChangeLog* files - and do so whenever git info changes?], [auto])

NUT_ARG_WITH([docs-changelog-start], [(auto|GitTreeish)], [Starting point (Git commit ID) when generating ChangeLog* files], [auto])
NUT_ARG_WITH([docs-changelog-end], [GitTreeish], [Ending point (Git commit ID) when generating ChangeLog* files], [HEAD])

dnl Different OS distributions have different layouts of man page section
dnl numbers. The one we treat as default seems to be most wide-spread, in
dnl Linux and FreeBSD. For others, there are other defaults (see `man man`
dnl on your platform to port defaults here), and builders can override with
dnl options further below.
m4_define([m4nut_DEFAULT_MAN_SECTION_API], [3])
m4_define([m4nut_DEFAULT_MAN_SECTION_CFG], [5])
m4_define([m4nut_DEFAULT_MAN_SECTION_CMD_SYS], [8])
m4_define([m4nut_DEFAULT_MAN_SECTION_CMD_USR], [1])
m4_define([m4nut_DEFAULT_MAN_SECTION_MISC], [7])

dnl Should we use "man1" or "man1m"?
m4_define([m4nut_DEFAULT_MAN_DIR_AS_BASE], [yes])

dnl Initiate shell variables to customize below:
DEFAULT_MAN_SECTION_API='m4nut_DEFAULT_MAN_SECTION_API'
DEFAULT_MAN_SECTION_CFG='m4nut_DEFAULT_MAN_SECTION_CFG'
DEFAULT_MAN_SECTION_CMD_SYS='m4nut_DEFAULT_MAN_SECTION_CMD_SYS'
DEFAULT_MAN_SECTION_CMD_USR='m4nut_DEFAULT_MAN_SECTION_CMD_USR'
DEFAULT_MAN_SECTION_MISC='m4nut_DEFAULT_MAN_SECTION_MISC'
DEFAULT_MAN_DIR_AS_BASE='m4nut_DEFAULT_MAN_DIR_AS_BASE'

case "${target_os}" in
    solaris*|sunos*|SunOS*|illumos*)
        dnl Note: this regards target OS standard layout as documented in
        dnl https://docs.oracle.com/cd/E23824_01/html/821-1451/gladp.html
        dnl but may not fit certain packaging projects
        dnl FIXME https://github.com/networkupstools/nut/issue/3314 :
        dnl  If we have no tools or wish to build man pages, and would
        dnl  just deliver what we have in dist tarball (or otherwise), we
        dnl  must keep the original names and cross-links of files we copy
        dnl  (no section substitutions then!)
        DEFAULT_MAN_SECTION_CMD_SYS="1m"
        DEFAULT_MAN_DIR_AS_BASE="no"
        ;;
esac

dnl Report the defaults we would use in args
AC_MSG_NOTICE([Platform ${target_os} default man page section for library APIs: '${DEFAULT_MAN_SECTION_API}'])
AC_MSG_NOTICE([Platform ${target_os} default man page section for configuration files: '${DEFAULT_MAN_SECTION_CFG}'])
AC_MSG_NOTICE([Platform ${target_os} default man page section for system management commands: '${DEFAULT_MAN_SECTION_CMD_SYS}'])
AC_MSG_NOTICE([Platform ${target_os} default man page section for user commands: '${DEFAULT_MAN_SECTION_CMD_USR}'])
AC_MSG_NOTICE([Platform ${target_os} default man page section for overviews, conventions, and miscellaneous: '${DEFAULT_MAN_SECTION_MISC}'])

dnl NOTE: Sections may be strings, not pure numbers, on some platforms.
dnl NOTE: Weird formatting (m4nut... outside brackets) helps avoid spurious
dnl end of line in help text before the value (left alone on a short line).
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([docs-man-section-api], [], [man page section for library APIs], [${DEFAULT_MAN_SECTION_API}], [platform-dependent, usually ]m4nut_DEFAULT_MAN_SECTION_API)
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([docs-man-section-cfg], [], [man page section for configuration files], [${DEFAULT_MAN_SECTION_CFG}], [platform-dependent, usually ]m4nut_DEFAULT_MAN_SECTION_CFG)
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([docs-man-section-cmd-sys], [], [man page section for system management commands], [${DEFAULT_MAN_SECTION_CMD_SYS}], [platform-dependent, usually ]m4nut_DEFAULT_MAN_SECTION_CMD_SYS)
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([docs-man-section-cmd-usr], [], [man page section for user commands], [${DEFAULT_MAN_SECTION_CMD_USR}], [platform-dependent, usually ]m4nut_DEFAULT_MAN_SECTION_CMD_USR)
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([docs-man-section-misc], [], [man page section for overviews, conventions, and miscellaneous], [${DEFAULT_MAN_SECTION_MISC}], [platform-dependent, usually ]m4nut_DEFAULT_MAN_SECTION_MISC)

NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([docs-man-dir-as-base], [], [are platform man directories named by base number (yes) or full section name (no)], [${DEFAULT_MAN_DIR_AS_BASE}], [platform-dependent, usually ]m4nut_DEFAULT_MAN_DIR_AS_BASE)

NUT_ARG_WITH([docs-man-linkmanext-template], [asciidoc template for "linkmanext" tags (distro-dependent)], [auto])
NUT_ARG_WITH([docs-man-linkmanext2-template], [asciidoc template for "linkmanext2" tags (distro-dependent)], [auto])
NUT_ARG_ENABLE([docs-man-linkmanext-section-rewrite], [Should external man page sections be adjusted in URL references?], [auto])

dnl NOTE: Until X-Mas 2021, the default was "legacy" (now "medium")
NUT_ARG_ENABLE([warnings],
    [enable warning presets that were picked as useful in maintainership and CI practice (variants include gcc-minimal, gcc-medium, gcc-hard, clang-minimal, clang-medium, clang-hard, all; auto-choosers: hard, medium, minimal, yes=auto='gcc or clang or all at hardcoded default difficulty')],
    [auto])
NUT_ARG_ENABLE([Werror],
    [fail the build if compiler emits any warnings (treat them as errors)],
    [no])
NUT_ARG_WITH([debuginfo],
    [enable compiler options for debug-friendly builds of all NUT binaries ("no" by default; "auto" means "yes unless CFLAGS say otherwise")],
    [no])
dnl To help find warning/error details in a wall of text, see --enable-Wcolor handled above

dnl ----------------------------------------------------------------------
dnl Check for with-ssl, and --with-nss or --with-openssl which can be used
dnl by NUT as well as its networking-capable dependencies (net-snmp, etc.)
dnl Only one can be enabled at a time, with a preference for OpenSSL
dnl if both are available

nut_ssl_lib=""

NUT_ARG_WITH([ssl], [enable SSL support (either NSS or OpenSSL)], [auto])
NUT_ARG_WITH([nss], [enable SSL support using Mozilla NSS], [auto])
NUT_ARG_WITH([openssl], [enable SSL support using OpenSSL], [auto])
NUT_ARG_WITH([ssl-client-validation], [enable SSL client certificate validation ability (currently requires NSS, beware issue #3329)], [auto])

dnl ${nut_with_ssl}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_ssl}" != "no"; then
   dnl check if either NSS or OpenSSL was explicitly requested
   if test "${nut_with_nss}" = "yes" || test "${nut_with_ssl}" = "nss" ; then
      NUT_CHECK_LIBNSS
      if test "${nut_have_libnss}" != "yes"; then
         AC_MSG_ERROR([Mozilla NSS not found (required for SSL support)])
      fi
   elif test "${nut_with_openssl}" = "yes" || test "${nut_with_ssl}" = "openssl" ; then
      NUT_CHECK_LIBOPENSSL
      if test "${nut_have_openssl}" != "yes"; then
         AC_MSG_ERROR([OpenSSL not found (required for SSL support)])
      fi
   else
      dnl e.g. "auto" or "yes": want *some* SSL, prefer OpenSSL over NSS otherwise
      NUT_CHECK_LIBOPENSSL
      if test "${nut_have_openssl}" != "yes"; then
         NUT_CHECK_LIBNSS
         if test "${nut_have_libnss}" != "yes"; then
            dnl Only abort if SSL has been explicitly requested by the user
            if test "${nut_with_ssl}" = "yes"; then
               AC_MSG_ERROR([Neither Mozilla NSS nor OpenSSL was found, but one is needed for the requested SSL support.])
            else
               AC_MSG_WARN([Neither Mozilla NSS nor OpenSSL was found (required for SSL support)])
            fi
            nut_with_ssl="no"
         else
            nut_with_nss="${nut_have_libnss}"
         fi
      else
         nut_with_openssl="${nut_have_openssl}"
      fi
   fi
fi

AM_CONDITIONAL(WITH_NSS, test "${nut_with_nss}" = "yes")
AM_CONDITIONAL(WITH_OPENSSL, test "${nut_with_openssl}" = "yes")

NUT_REPORT_FEATURE([enable SSL support], [${nut_with_ssl}], [${nut_ssl_lib}],
					[WITH_SSL], [Define to enable SSL])

AS_CASE([${nut_with_ssl_client_validation}],
    [no], [],
    [yes|""], [nut_with_ssl_client_validation="yes"],
        dnl TOTHINK: reject if openssl/none build?
    [auto|*], [nut_with_ssl_client_validation="no"]
        dnl Until #3329 is solved, auto==no
)
NUT_REPORT_FEATURE([enable SSL client certificate validation],
	[${nut_with_ssl_client_validation}], [],
	[WITH_CLIENT_CERTIFICATE_VALIDATION],
	[Define to enable SSL client certificate validation])

dnl ----------------------------------------------------------------------
dnl Check for presence and compiler flags of various libraries

NUT_ARG_WITH([serial], [build and install serial-only drivers], [yes])

dnl These checks are performed unconditionally, even if the corresponding
dnl --with-* options are not given. This is because we cannot predict
dnl what will be in the --with-drivers argument.

NUT_CHECK_LIBREGEX
NUT_ARG_WITH([usb], [build and install USB drivers, optionally require build with specified version of libusb library and API: (auto|libusb-0.1|libusb-1.0)], [auto])
nut_usb_lib=""
NUT_CHECK_LIBUSB

NUT_ARG_WITH([snmp], [build and install SNMP drivers], [auto])
NUT_CHECK_LIBNETSNMP

NUT_ARG_WITH([neon], [build and install neon based XML/HTTP driver], [auto])
NUT_CHECK_LIBNEON

NUT_ARG_WITH([powerman], [build and install Powerman PDU client driver], [auto])
NUT_CHECK_LIBPOWERMAN

NUT_ARG_WITH([modbus], [build and install modbus drivers], [auto])
NUT_CHECK_LIBMODBUS

NUT_ARG_WITH([gpio], [build and install GPIO driver], [auto])
NUT_CHECK_LIBGPIO

NUT_ARG_WITH([avahi], [build and install Avahi support], [auto])
NUT_CHECK_LIBAVAHI

NUT_ARG_WITH([ipmi], [build and install IPMI PSU driver], [auto])
NUT_ARG_WITH([freeipmi], [enable IPMI support using FreeIPMI], [auto])
dnl NUT_ARG_WITH([openipmi], [enable IPMI support using OpenIPMI], [auto])

dnl Platform-dependent drivers, currently their detection code is directly
dnl spelled out in configure.ac
NUT_ARG_WITH([macosx_ups], [build and install Mac OS X Power Sources meta-driver], [auto])
NUT_ARG_WITH([linux_i2c], [build and install i2c drivers], [auto])
NUT_ARG_WITH([upower], [build and install UPower driver and nut-scanner support (requires GLib/GIO)], [auto])
NUT_CHECK_LIBGLIB

dnl A Python GUI client application for the sysadmin desktop
dnl (not necessarily on the NUT server itself):
NUT_ARG_WITH([nut_monitor], [install the NUT-Monitor GUI files], [auto])
NUT_ARG_WITH([pynut], [install the PyNUT module files (yes, no, app, auto)], [auto])
dnl Note: we did NUT_CHECK_PYTHON2 NUT_CHECK_PYTHON3 etc above,
dnl and if at all possible, we generate the files from .in templates
dnl anyway by running this configure script. The question is about
dnl installing these features or not.
dnl Note: more for tests than other reasons, there is also an option
dnl value to "force" the installation.

dnl The gettext "msgfmt" tool (or equivalent) can be used to maintain
dnl human-language text translations. Currently this is used specifically
dnl in the Python NUT-Monitor app sources (*.po => *.mo conversions).
AC_PATH_PROGS([MSGFMT], [msgfmt], [none])
AM_CONDITIONAL([HAVE_MSGFMT], [test "x${MSGFMT}" != "xnone"])

dnl ----------------------------------------------------------------------
dnl checks related to --with-serial

dnl ${nut_with_serial}: any value except "yes" or "no" is treated as "auto".
dnl Below we try to detect if we can build serial drivers, and if we must?
AS_IF([test "${nut_with_serial}" != "no"],
    [AS_IF([test "${nut_with_serial}" != "yes"],[nut_with_serial="auto"])

    CFLAGS_SAVED_SERIAL="${CFLAGS}"
    AS_IF([test "${GCC}" = yes],
        [CFLAGS_SAVED_WERROR="${CFLAGS} -Wall -Werror"
         CFLAGS_SAVED_WNOERROR="${CFLAGS} -Wno-error"
        ],
        [CFLAGS_SAVED_WERROR="${CFLAGS}"
         CFLAGS_SAVED_WNOERROR="${CFLAGS}"
        ])

    dnl At least recent *BSD distros have deprecated sys/termios.h and spew
    dnl warnings that termios.h should be used instead. This is redundantly
    dnl fatal for pedantic builds where we aim to have no warnings in code.
    dnl So there AC_CHECK_HEADERS does find the header, but we don't really
    dnl want to use it unless we have no choice: if there is a warning while
    dnl trying sys/ version, try the plain header path (without fatal warnings),
    dnl and only if that is missing - retry with the sys/ version again (and
    dnl no warnings still).

    CFLAGS="${CFLAGS_SAVED_WERROR}"
    AC_CHECK_HEADERS(sys/termios.h, [], [
        CFLAGS="${CFLAGS_SAVED_WNOERROR}"
        AC_CHECK_HEADERS(termios.h, [], [
            AC_CHECK_HEADERS(sys/termios.h, [], [], [AC_INCLUDES_DEFAULT])
            ], [AC_INCLUDES_DEFAULT])
        ], [AC_INCLUDES_DEFAULT])

    dnl CFLAGS at this point suffice for surviving a compilation with termios.h

    dnl Don't mind the stupid code below, it just probes the tokens and
    dnl sails around compiler warnings
    AC_MSG_CHECKING([for struct termios and speed_t])
    AC_LANG_PUSH([C])
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
#if defined(HAVE_SYS_TERMIOS_H)
#  include <sys/termios.h>      /* for speed_t */
#else
# if defined(HAVE_TERMIOS_H)
#  include <termios.h>
# endif /* HAVE_TERMIOS_H */
#endif /* HAVE_SYS_TERMIOS_H */
void getspeed(speed_t* b) { *b = B19200; }
],
[struct termios tio;
if (!tcgetattr(0, &tio)) { return 1; }
speed_t baudrate;
getspeed(&baudrate);
]
        )],
        [AC_MSG_RESULT([ok])
         nut_have_serial_types=yes
        ],
        [AC_MSG_RESULT([no, struct termios and/or speed_t not found in discovered headers])
         nut_have_serial_types=no
        ]
     )
     AC_LANG_POP([C])

     dnl Restore common set-or-discovered CFLAGS
     CFLAGS="${CFLAGS_SAVED_SERIAL}"

     AC_MSG_CHECKING([whether we can build serial drivers])
     AS_CASE(["${target_os}"],
        [*mingw*], [
             AS_IF([test "${nut_have_serial_types}" != yes],
                [AC_MSG_WARN([not with system includes, but can try with our fallback for the target platform])
                 nut_have_serial_types=yes]
             )
        ])
     AS_IF([test "${nut_have_serial_types}" = yes],
        [AS_IF([test "${nut_with_serial}" = "auto"],[nut_with_serial="yes"])],
        [AS_IF([test "${nut_with_serial}" = "auto"],[nut_with_serial="no"])
         AS_IF([test "${nut_with_serial}" = "yes"],[AC_MSG_ERROR([no, and were required to])])
        ])
     AS_IF([test "${nut_with_serial}" = "yes"],
        [AC_MSG_RESULT([yes])],
        [AC_MSG_RESULT([no])])
])

NUT_REPORT_DRIVER([build serial drivers], [${nut_with_serial}], [],
					[WITH_SERIAL], [Define to enable serial support])

dnl ----------------------------------------------------------------------
dnl checks related to --with-usb are in its m4 file and NUT_CHECK_LIBUSB() called above

dnl Note: there is no libusb-config script (and variable) for libusb-1.0
AM_CONDITIONAL(WITH_LIBUSB_1_0, test "${nut_usb_lib}" = "(libusb-1.0)")
AM_CONDITIONAL(WITH_LIBUSB_0_1, test "${nut_usb_lib}" = "(libusb-0.1)" -o "${nut_usb_lib}" = "(libusb-0.1-config)")

NUT_REPORT_DRIVER([build USB drivers], [${nut_with_usb}], [${nut_usb_lib}],
					[WITH_USB], [Define to enable USB support])

dnl ----------------------------------------------------------------------
dnl checks related to --with-neon

dnl ${nut_with_neon}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_neon}" = "yes" -a "${nut_have_neon}" != "yes"; then
   AC_MSG_ERROR([neon libraries not found, required for neon based XML/HTTP driver])
fi

if test "${nut_with_neon}" != "no"; then
   nut_with_neon="${nut_have_neon}"
fi

NUT_REPORT_DRIVER([build neon based XML driver], [${nut_with_neon}], [],
					[WITH_NEON], [Define to enable Neon HTTP support])
AM_CONDITIONAL([HAVE_NEON], [test "${nut_have_neon}" = "yes"])

dnl ----------------------------------------------------------------------
dnl checks related to --with-avahi

dnl ${nut_with_avahi}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_avahi}" = "yes" -a "${nut_have_avahi}" != "yes"; then
   AC_MSG_ERROR([avahi libraries not found])
fi

if test "${nut_with_avahi}" != "no"; then
   nut_with_avahi="${nut_have_avahi}"
fi

NUT_REPORT_FEATURE([enable Avahi support], [${nut_with_avahi}], [],
					[WITH_AVAHI], [Define to enable Avahi support])

dnl ----------------------------------------------------------------------
dnl checks related to --with-powerman

dnl ${nut_with_powerman}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_powerman}" = "yes" -a "${nut_have_libpowerman}" != "yes"; then
   AC_MSG_ERROR([Powerman client libraries not found, required for Powerman PDU client driver])
fi

if test "${nut_with_powerman}" != "no"; then
   nut_with_powerman="${nut_have_libpowerman}"
fi

NUT_REPORT_DRIVER([build Powerman PDU client driver], [${nut_with_powerman}], [],
					[WITH_LIBPOWERMAN], [Define to enable Powerman PDU support])

dnl ----------------------------------------------------------------------
dnl checks related to --with-modbus

dnl ${nut_with_modbus}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_modbus}" = "yes" -a "${nut_have_libmodbus}" != "yes"; then
   AC_MSG_ERROR([modbus library not found, required for Modbus drivers])
fi

if test "${nut_with_modbus_and_usb}" = "yes" -a "${nut_have_libmodbus_usb}" != "yes"; then
   AC_MSG_ERROR([modbus library variant with RTU USB support not found, required for USB-capable Modbus drivers])
fi

if test "${nut_with_modbus}" != "no"; then
   nut_with_modbus="${nut_have_libmodbus}"
fi

NUT_REPORT_DRIVER([build Modbus drivers], [${nut_with_modbus}], [],
					[WITH_MODBUS], [Define to enable Modbus support])

AS_IF([test "${nut_with_modbus}" != "no"], [
	dnl Only display this detail when building modbus at all
	dnl Config definition NUT_MODBUS_HAS_USB is set in the
	dnl detection method (if nut_have_libmodbus_usb=="yes")
	NUT_REPORT_DRV([build Modbus drivers with RTU USB support], [${nut_have_libmodbus_usb}])
])
AM_CONDITIONAL(WITH_MODBUS_USB, [test "${nut_with_modbus}" = "yes" && test "${nut_have_libmodbus_usb}" = yes && test "${nut_with_usb}" = yes && test "${nut_with_modbus_and_usb}" != "no"])

dnl ----------------------------------------------------------------------
dnl Check for with-ipmi, and --with-freeipmi (or --with-openipmi)
dnl Only one can be enabled at a time, with a preference for FreeIPMI
dnl if both are available (since it is the only one supported ATM!!)

nut_ipmi_lib=""

dnl ${nut_with_ipmi}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_ipmi}" != "no"; then
   dnl check if FreeIPMI (and maybe later OpenIPMI) was explicitly requested
   if test "${nut_with_freeipmi}" = "yes"; then
      NUT_CHECK_LIBFREEIPMI
      if test "${nut_have_freeipmi}" != "yes"; then
         AC_MSG_ERROR([FreeIPMI not found, required for IPMI support])
      fi
      dnl Implies --with-ipmi
      nut_with_ipmi="yes"
   dnl elif test "${nut_with_openipmi}" = "yes"; then
      dnl AC_MSG_ERROR([OpenIPMI is not yet supported])
      dnl NUT_CHECK_LIBOPENIPMI
      dnl if test "${nut_have_openipmi}" != "yes"; then
      dnl    AC_MSG_ERROR([OpenIPMI not found, required for IPMI support])
      dnl fi
      dnl    Implies --with-ipmi
      dnl    nut_with_ipmi="yes"
      dnl    AC_DEFINE(WITH_OPENIPMI, 1, [Define to enable IPMI support using OpenIPMI])
   else
      dnl Prefer FreeIPMI over OpenIPMI otherwise
      NUT_CHECK_LIBFREEIPMI
      if test "${nut_have_freeipmi}" != "yes"; then
         if test "${nut_with_ipmi}" = "yes"; then
            AC_MSG_ERROR([FreeIPMI not found, required for IPMI support])
         fi
         nut_with_ipmi="no"
         dnl NUT_CHECK_OPENIPMI
         dnl if test "${nut_have_openipmi}" != "yes"; then
         dnl    if test "${nut_with_ipmi}" = "yes"; then
         dnl       AC_MSG_ERROR([Neither GNU FreeIPMI nor OpenIPMI was found (required for IPMI support)])
         dnl    fi
         dnl    nut_with_ipmi="no"
         dnl else
         dnl    Implies --with-ipmi
         dnl    nut_with_ipmi="yes"
         dnl    nut_with_openipmi="yes"
         dnl fi
      else
         dnl Implies --with-ipmi
         nut_with_ipmi="yes"
         nut_with_freeipmi="yes"
         AC_DEFINE(WITH_FREEIPMI, 1, [Define to enable IPMI support using FreeIPMI])
      fi
   fi
fi


NUT_REPORT_DRIVER([build IPMI driver], [${nut_with_ipmi}], [${nut_ipmi_lib}],
					[WITH_IPMI], [Define to enable IPMI support])

dnl Note: we still have to manually enable complementary AC_DEFINEs (see above)
dnl and AM_CONDITIONALs (see below)...
AM_CONDITIONAL(WITH_FREEIPMI, test "${nut_with_freeipmi}" = "yes")
dnl AM_CONDITIONAL(WITH_OPENIPMI, test "${nut_with_openipmi}" = "yes")

dnl ----------------------------------------------------------------------
dnl Check for with-gpio

if test "${nut_with_gpio}" = "yes" -a "${nut_have_gpio}" != "yes"; then
   AC_MSG_ERROR([No supported GPIO library was found, required for GPIO driver])
fi

dnl ${nut_with_gpio}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_gpio}" != "no"; then
   nut_with_gpio="${nut_have_gpio}"
fi

dnl NOTE: m4 scriptlet also defines WITH_LIBGPIO_VERSION like 0x00020000 in config.h
AS_IF([test x"${GPIO_VERSION}" = xnone], [
	REPORT_GPIO_VERSION="library version not detected"
],[
	REPORT_GPIO_VERSION="library v${GPIO_VERSION}"
])
NUT_REPORT_DRIVER([build GPIO driver (${REPORT_GPIO_VERSION})], [${nut_with_gpio}], [${nut_gpio_lib}],
					[WITH_GPIO], [Define to enable GPIO support])
unset REPORT_GPIO_VERSION

dnl ----------------------------------------------------------------------
dnl The Mac OS X meta-driver looks at IOKit Power Sources keys managed by
dnl the internal USB UPS driver.
dnl
dnl FIXME: be slightly more clever here:

if test "${nut_with_macosx_ups}" != no; then
   if test -d /System/Library/Frameworks/IOKit.framework/ ; then
      nut_with_macosx_ups="yes"
   else
      if test "${nut_with_macosx_ups}" = yes; then
          AC_MSG_ERROR([macosx-ups was required but can not be fulfilled for this build: not MacOS])
      fi
      nut_with_macosx_ups="no"
   fi
fi

NUT_REPORT_DRIVER([build Mac OS X meta-driver],
			[${nut_with_macosx_ups}], [${nut_macosx_ups_lib}],
			[WITH_MACOSX], [Define to enable Mac OS X meta-driver])

dnl ----------------------------------------------------------------------
dnl checks related to --with-upower
dnl Check if we have detected libGLib / libGIO above (Required for the
dnl nut-upower driver and/or nut-scanner UPower support)
dnl NOTE: Do not confuse libglib{2} (GNOME) with glibc (part of compiler)
dnl ----------------------------------------------------------------------

AC_MSG_CHECKING([whether to build nut-upower driver and nut-scanner support])
AS_IF([test "${nut_have_libglib}${nut_have_libgio}" = "yesyes"], [
	AS_CASE(["${nut_with_upower}"],
		[yes|auto], [nut_with_upower=yes]
	)
], [
	AS_CASE(["${nut_with_upower}"],
		[yes], [AC_MSG_ERROR([GLib/GIO not found but requested via --with-upower])],
		[auto],[AC_MSG_WARN([GLib/GIO not found. The 'nut-upower' driver will not be built.])]
	)
	nut_with_upower=no
])

AC_MSG_RESULT(${nut_with_upower})
NUT_REPORT_DRIVER([build UPower driver and nut-scanner support],
			[${nut_with_upower}], [],
			[WITH_UPOWER], [Define to build UPower driver and nut-scanner support])

dnl ----------------------------------------------------------------------
dnl checks related to --with_linux_i2c
dnl Check for i2c header on Linux, used for ASEM UPS driver
LIBI2C_LIBS=""
if test "${nut_with_linux_i2c}" != no; then
    case ${target_os} in
        linux* )
            AC_CHECK_HEADER(
                [linux/i2c-dev.h],
                [AC_DEFINE([HAVE_LINUX_I2C_DEV_H], [1],
                    [Define to 1 if you have <linux/i2c-dev.h>.])]
            )
            AC_CHECK_HEADER(
                [i2c/smbus.h],
                [AC_DEFINE([HAVE_LINUX_SMBUS_H], [1],
                    [Define to 1 if you have <i2c/smbus.h>.])]
            )
            nut_have_linux_i2c="no"
            AC_CHECK_DECLS(
                [i2c_smbus_access, i2c_smbus_read_byte_data, i2c_smbus_write_byte_data, i2c_smbus_read_word_data, i2c_smbus_write_word_data, i2c_smbus_read_block_data],
                [nut_have_linux_i2c="yes"],
                [],
                [#include <stdio.h>
                 #ifdef HAVE_LINUX_I2C_DEV_H
                 #include <linux/i2c-dev.h>
                 #endif
                 #ifdef HAVE_LINUX_SMBUS_H
                 #include <i2c/smbus.h>
                 #endif
                ]
            )
            dnl Builds for bitness/arch other than system default can be
            dnl "compromised" by lack of respective binary library, so
            dnl even if we have the right headers, ultimate link fails.
            dnl Note: here we keep the verdict from above, or make it worse.
            LIBS_SAVED="$LIBS"
            LIBS=""
            AS_IF([test "${nut_have_linux_i2c}" = yes], [
                nut_have_linux_i2c="no"
                AC_SEARCH_LIBS(i2c_smbus_read_byte, i2c, [
                AC_SEARCH_LIBS(i2c_smbus_access, i2c, [
                AC_SEARCH_LIBS(i2c_smbus_read_byte_data, i2c, [
                AC_SEARCH_LIBS(i2c_smbus_write_byte_data, i2c, [
                AC_SEARCH_LIBS(i2c_smbus_read_word_data, i2c, [
                AC_SEARCH_LIBS(i2c_smbus_write_word_data, i2c, [
                AC_SEARCH_LIBS(i2c_smbus_read_block_data, i2c, [
                    [nut_have_linux_i2c="yes"]
                ])])])])])])])])

            dnl # Note: *with* (desire) is not "no" in this big if-clause
            AS_IF([test "${nut_have_linux_i2c}" = yes],
                [nut_with_linux_i2c="yes"],
                [AS_IF([test "${nut_with_linux_i2c}" = "yes"],
                    [AC_MSG_ERROR(i2c was required but can not be fulfilled for this build)],
                    [nut_with_linux_i2c="no"])
                ])

            LIBI2C_LIBS="$LIBS"
            LIBS="$LIBS_SAVED"
            ;;
        * )
            if test "${nut_with_linux_i2c}" = yes; then
                AC_MSG_ERROR([i2c was required but can not be fulfilled for this build: not linux])
            fi
            nut_with_linux_i2c="no"
            ;;
    esac
fi
NUT_REPORT_DRIVER(
    [build i2c based drivers],
    [${nut_with_linux_i2c}],
    [],
    [WITH_LINUX_I2C],
    [Define to enable I2C support]
)

dnl ----------------------------------------------------------------------
dnl Check for --with-wrap

NUT_ARG_WITH([wrap], [enable libwrap (tcp-wrappers) support], [auto])

dnl ${nut_with_wrap}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_wrap}" != "no"; then
   dnl check for libwrap compiler flags
   NUT_CHECK_LIBWRAP
fi

if test "${nut_with_wrap}" = "yes" -a "${nut_have_libwrap}" != "yes"; then
   AC_MSG_ERROR([libwrap not found])
fi

if test "${nut_with_wrap}" != "no"; then
   nut_with_wrap="${nut_have_libwrap}"
fi

NUT_REPORT_FEATURE([enable libwrap (tcp-wrappers) support], [${nut_with_wrap}], [],
					[WITH_WRAP], [Define to enable libwrap (tcp-wrappers) support])


dnl ----------------------------------------------------------------------
dnl Check for --with-libltdl and --with-nut-scanner

dnl Note: libltdl is primarily used by nut-scanner now; however some
dnl side projects and forks of NUT have more creative uses for it
dnl and might eventually land in NUT codebase proper.
NUT_ARG_WITH([libltdl], [enable libltdl (Libtool dlopen abstraction) support], [auto])

dnl Note: default could be overridden above by --with-all handling.
dnl While nut-scanner decides at run-time if it would use third-party shared
dnl library files (bundled along or not, if available for the platform), its
dnl binary must be configured now and built against their headers at least.
NUT_ARG_WITH([nut-scanner], [build and install nut-scanner tool (requires libltdl; optionally libusb, libneon, libsnmp)], [auto])

dnl ${nut_with_libltdl}: any value except "yes" or "no" is treated as "auto".
if test x"${nut_with_libltdl}" != x"no"; then
    if test x"${nut_with_nut_scanner}" = x"yes"; then
        dnl Require libltdl to be present (or fail the configure script)
        nut_with_libltdl="yes"
    fi

    dnl check for libltdl compiler flags
    NUT_CHECK_LIBLTDL
fi

if test x"${nut_with_libltdl}" = x"yes" -a x"${nut_have_libltdl}" != x"yes"; then
    AC_MSG_ERROR([libltdl not found])
fi

if test x"${nut_with_libltdl}" != x"no"; then
    nut_with_libltdl="${nut_have_libltdl}"
fi

NUT_REPORT_FEATURE([enable libltdl (Libtool dlopen abstraction) support], [${nut_with_libltdl}], [],
					[WITH_LIBLTDL], [Define to enable libltdl (Libtool dlopen abstraction) support])

dnl Explicitly report if we are building nut-scanner or not
dnl since it requires libltdl
if test x"${nut_with_libltdl}" = x"no" && test x"${nut_with_nut_scanner}" = x"yes"; then
    AC_MSG_ERROR([libltdl support was disabled or not found, but --with-nut-scanner was requested and requires it])
fi

if test x"${nut_with_nut_scanner}" = x"auto"; then
    nut_with_nut_scanner="${nut_with_libltdl}"
fi

NUT_REPORT_PROGRAM([build nut-scanner], [${nut_with_nut_scanner}], [],
					[WITH_NUT_SCANNER], [Define to enable nut-scanner tool support])

dnl ----------------------------------------------------------------------
dnl checks related to --with-cgi

NUT_ARG_WITH([cgi], [build and install the CGI programs], [no])

dnl ${nut_with_cgi}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_cgi}" != "no"; then
   dnl check for libgd compiler flags
   NUT_CHECK_LIBGD
fi

if test "${nut_with_cgi}" = "yes" -a "${nut_have_libgd}" != "yes"; then
   AC_MSG_ERROR([libgd not found, required for CGI build])
fi

if test "${nut_with_cgi}" != "no"; then
   nut_with_cgi="${nut_have_libgd}"
fi

NUT_REPORT_PROGRAM([build CGI programs], [${nut_with_cgi}], [],
					[WITH_CGI], [Define to enable CGI (HTTP) support])

# Built into HTML via templates:
NUT_ARG_WITH([cgi-uri], [default URI (under web-server root) where NUT CGI programs are exposed, typically /cgi-bin or /cgi-bin/nut], [auto])
AS_CASE([${target_os}],
	[*mingw*], [NUT_CGI_URI="/cgi-bin"],	dnl ### Let N4W build be easier to use out of the box (EXE tarball)
		[NUT_CGI_URI="/cgi-bin/nut"]
)
AS_CASE([${nut_with_cgi_uri}],
	[/*], [NUT_CGI_URI="${nut_with_cgi_uri}"],
	[auto], [AC_MSG_NOTICE([--with-cgi-uri defaulted to '${NUT_CGI_URI}' for this platform])],
		[AC_MSG_WARN([--with-cgi-uri must be a web server path starting with a slash; value '${nut_with_cgi_uri}' is invalid, defaulting to '${NUT_CGI_URI}'])]
)
AC_SUBST(NUT_CGI_URI)
AS_IF([test x"${nut_with_cgi}" = xyes], [
	NUT_REPORT([Default URI to NUT CGI programs], [${NUT_CGI_URI}])
])

dnl ----------------------------------------------------------------------
dnl checks related to --with-pynut and --with-nut_monitor

dnl The PYTHON*_REPORT vars also serve as flags that we have certain usable
dnl Python interpreter versions to care about below, so we only test for
dnl their existence once (in NUT_CHECK*PYTHON* m4 macros).

dnl ${nut_with_nut_monitor}: TODO: arg values to request Python 2 gtk2,
dnl Python 3 Qt5, Python 3 Qt6 or all
AC_MSG_CHECKING([if we want install NUT-Monitor desktop application])
AC_MSG_RESULT([${nut_with_nut_monitor}])
nut_with_nut_monitor_py2gtk2=""
nut_with_nut_monitor_py3qt5=""
nut_with_nut_monitor_py3qt6=""
nut_with_nut_monitor_desktop=""
dnl TODO: Add a way to define this path? will have app/ maybe module/ inside...
nut_with_nut_monitor_dir="${datarootdir}/nut-monitor"

PYTHON_FAILED_TEST_DETAILS=""
AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_nut_monitor-1: ${nut_with_nut_monitor}])
])
if test x"${nut_with_nut_monitor}" != xno ; then
    dnl While we might just install for "yes" request, in hopes user would
    dnl get their Python ecosystem in place later, we need some criteria to
    dnl avoid installing it always :) Also, need to substitute the shebang.
    if test -z "${PYTHON}${PYTHON2}${PYTHON3}" ; then
        case "${nut_with_nut_monitor}" in
            "auto") nut_with_nut_monitor="no"
                    PYTHON_FAILED_TEST_DETAILS="No Python 2/3 interpreter was found"
                ;;
            "yes")  AC_MSG_ERROR([No Python 2/3 interpreter was found, required for NUT-Monitor desktop application])
                ;;
        esac
    fi
fi
AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_nut_monitor-2: ${nut_with_nut_monitor}])
])

if test x"${nut_with_nut_monitor}" != xno ; then
    dnl Note: no double-quoting for use, the command string may be multi-token
    dnl HACK NOTE: Here we redirect outputs to "&5" which is autoconf stream
    dnl for "config.log" details since... forever? Still, hardcoded numbers...
    PYTHON2_TEST_MODULES="re,glob,codecs,gtk,gtk.glade,gobject,ConfigParser"
    PYTHON3_TEST_MODULES_QT5="re,glob,codecs,PyQt5.uic,configparser"
    PYTHON3_TEST_MODULES_QT6="re,glob,codecs,PyQt6.uic,configparser"
    if test -n "${PYTHON2_VERSION_INFO_REPORT}" -a -n "${PYTHON2}" ; then
        AC_MSG_CHECKING([if we have Python2 prerequisites for NUT-Monitor desktop application])
        if ${PYTHON2} -c "import ${PYTHON2_TEST_MODULES}" 1>&5 2>&5 \
        ; then
            nut_with_nut_monitor_py2gtk2="yes"
            AC_MSG_RESULT([yes])
        else
            AC_MSG_RESULT([no])
            case ${target_os} in
                solaris*|sunos*|SunOS*|illumos*)
                # At least on OpenIndiana, the pygobject-27 build is only
                # delivered in a 64-bit variant, while the default link to
                # the python2.7 script interpreter is 64-bit. This precludes
                # the use of NUT-Monitor-py2gtk2 which is otherwise possible
                # (and useful for testing) on the platform.
                AS_CASE([x"${PYTHON2}"],
                    [x*" "*], [],
                    [x/usr/bin/python*], [
                        AC_MSG_CHECKING([if a Solarish platform-specific build of Python2 fares better])
                        AS_CASE([x"${PYTHON2}"],
                            [x/usr/bin/python2], [TRY_PYTHON2_VERS="python2 python2.7 python2.6"],
                            [x/usr/bin/python], [TRY_PYTHON2_VERS="python python2 python2.7 python2.6"],
                                                [TRY_PYTHON2_VERS="`basename \"${PYTHON2}\"`"]
                        )
                        TRY_BASEDIR="`dirname \"${PYTHON}\"`"
                        for ARCHDIR in 64 amd64 sparcv9 32 i86 sparcv7 sparc ; do
                            for TRY_VERNAME in $TRY_PYTHON2_VERS ; do
                                TRY_PYTHON2="${TRY_BASEDIR}/${ARCHDIR}/${TRY_VERNAME}"
                                if ${TRY_PYTHON2} -c "import ${PYTHON2_TEST_MODULES}" 1>&5 2>&5 \
                                ; then
                                    nut_with_nut_monitor_py2gtk2="yes"
                                    AC_MSG_RESULT([yes with ${TRY_PYTHON2}])
                                    dnl FIXME: Track a separate interpreter variable for NUT-Monitor?
                                    PYTHON2="${TRY_PYTHON2}"
                                    break
                                fi
                            done
                            if test x"${nut_with_nut_monitor_py2gtk2}" = x"yes" ; then
                                break
                            fi
                        done
                        if test x"${nut_with_nut_monitor_py2gtk2}" != x"yes" ; then
                            AC_MSG_RESULT([no])
                        fi
                    ])
                ;;
            esac

            if test x"${nut_with_nut_monitor_py2gtk2}" != x"yes" ; then
                PYTHON_FAILED_TEST_DETAILS="Missing some or all of these Python2 modules: '${PYTHON2_TEST_MODULES}'"
            fi
        fi
    fi

    if test -n "${PYTHON3_VERSION_INFO_REPORT}" -a -n "${PYTHON3}" ; then
        AC_MSG_CHECKING([if we have Python3 Qt5 prerequisites for NUT-Monitor desktop application])
        if ${PYTHON3} -c "import ${PYTHON3_TEST_MODULES_QT5}" 1>&5 2>&5 \
        ; then
            nut_with_nut_monitor_py3qt5="yes"
            AC_MSG_RESULT([yes])
        else
            AC_MSG_RESULT([no])
            if test -n "${PYTHON_FAILED_TEST_DETAILS}" ; then
                PYTHON_FAILED_TEST_DETAILS="${PYTHON_FAILED_TEST_DETAILS} and some or all of these Python3 Qt5 modules: '${PYTHON3_TEST_MODULES_QT5}'"
            else
                PYTHON_FAILED_TEST_DETAILS="Missing some or all of these Python3 Qt5 modules: '${PYTHON3_TEST_MODULES_QT5}'"
            fi
        fi
    fi

    if test -n "${PYTHON3_VERSION_INFO_REPORT}" -a -n "${PYTHON3}" ; then
        AC_MSG_CHECKING([if we have Python3 Qt6 prerequisites for NUT-Monitor desktop application])
        if ${PYTHON3} -c "import ${PYTHON3_TEST_MODULES_QT6}" 1>&5 2>&5 \
        ; then
            nut_with_nut_monitor_py3qt6="yes"
            AC_MSG_RESULT([yes])
        else
            AC_MSG_RESULT([no])
            if test -n "${PYTHON_FAILED_TEST_DETAILS}" ; then
                PYTHON_FAILED_TEST_DETAILS="${PYTHON_FAILED_TEST_DETAILS} and some or all of these Python3 Qt6 modules: '${PYTHON3_TEST_MODULES_QT6}'"
            else
                PYTHON_FAILED_TEST_DETAILS="Missing some or all of these Python3 Qt6 modules: '${PYTHON3_TEST_MODULES_QT6}'"
            fi
        fi
    fi

    dnl Fall back to default interpreter
    if test -z "${nut_with_nut_monitor_py2gtk2}${nut_with_nut_monitor_py3qt5}${nut_with_nut_monitor_py3qt6}" \
    && test -n "${PYTHON_VERSION_INFO_REPORT}" -a -n "${PYTHON}" \
    && test x"${PYTHON_VERSION_INFO_REPORT}" != x"${PYTHON3_VERSION_INFO_REPORT}" \
    && test x"${PYTHON_VERSION_INFO_REPORT}" != x"${PYTHON2_VERSION_INFO_REPORT}" \
    ; then
        AC_MSG_CHECKING([if we have Python3 Qt5 prerequisites for NUT-Monitor desktop application in default Python])
        if ${PYTHON} -c "import ${PYTHON3_TEST_MODULES_QT5}" 1>&5 2>&5 \
        ; then
            nut_with_nut_monitor_py3qt5="yes"
            AC_MSG_RESULT([yes])
        else
            AC_MSG_RESULT([no])
            if test -n "${PYTHON_FAILED_TEST_DETAILS}" ; then
                PYTHON_FAILED_TEST_DETAILS="${PYTHON_FAILED_TEST_DETAILS} and some or all of these Python3 Qt5 modules in default Python: '${PYTHON3_TEST_MODULES_QT5}'"
            else
                PYTHON_FAILED_TEST_DETAILS="Missing some or all of these Python3 Qt5 modules in default Python: '${PYTHON3_TEST_MODULES_QT5}'"
            fi
        fi

        AC_MSG_CHECKING([if we have Python3 Qt6 prerequisites for NUT-Monitor desktop application in default Python])
        if ${PYTHON} -c "import ${PYTHON3_TEST_MODULES_QT6}" 1>&5 2>&5 \
        ; then
            nut_with_nut_monitor_py3qt6="yes"
            AC_MSG_RESULT([yes])
        else
            AC_MSG_RESULT([no])
            if test -n "${PYTHON_FAILED_TEST_DETAILS}" ; then
                PYTHON_FAILED_TEST_DETAILS="${PYTHON_FAILED_TEST_DETAILS} and some or all of these Python3 Qt6 modules in default Python: '${PYTHON3_TEST_MODULES_QT6}'"
            else
                PYTHON_FAILED_TEST_DETAILS="Missing some or all of these Python3 Qt6 modules in default Python: '${PYTHON3_TEST_MODULES_QT6}'"
            fi
        fi

        AC_MSG_CHECKING([if we have Python2 prerequisites for NUT-Monitor desktop application in default Python])
        if ${PYTHON} -c "import ${PYTHON2_TEST_MODULES}" 1>&5 2>&5 \
        ; then
            nut_with_nut_monitor_py2gtk2="yes"
            PYTHON_FAILED_TEST_DETAILS=""
            AC_MSG_RESULT([yes])
        else
            AC_MSG_RESULT([no])

            case ${target_os} in
                solaris*|sunos*|SunOS*|illumos*)
                # See somments above
                AS_CASE([x"${PYTHON}"],
                    [x*" "*], [],
                    [x/usr/bin/python*], [
                        AC_MSG_CHECKING([if a Solarish platform-specific build of Python2 fares better])
                        AS_CASE([x"${PYTHON}"],
                            [x/usr/bin/python2], [TRY_PYTHON2_VERS="python2 python2.7 python2.6"],
                            [x/usr/bin/python], [TRY_PYTHON2_VERS="python python2 python2.7 python2.6"],
                                                [TRY_PYTHON2_VERS="`basename \"${PYTHON}\"`"]
                        )
                        TRY_BASEDIR="`dirname \"${PYTHON}\"`"
                        for ARCHDIR in 64 amd64 sparcv9 32 i86 sparcv7 sparc ; do
                            for TRY_VERNAME in $TRY_PYTHON2_VERS ; do
                                TRY_PYTHON2="${TRY_BASEDIR}/${ARCHDIR}/${TRY_VERNAME}"
                                if ${TRY_PYTHON2} -c "import ${PYTHON2_TEST_MODULES}" 1>&5 2>&5 \
                                ; then
                                    nut_with_nut_monitor_py2gtk2="yes"
                                    AC_MSG_RESULT([yes with ${TRY_PYTHON2}])
                                    dnl FIXME: Track a separate interpreter variable for NUT-Monitor?
                                    PYTHON="${TRY_PYTHON2}"
                                    break
                                fi
                            done
                            if test x"${nut_with_nut_monitor_py2gtk2}" = x"yes" ; then
                                break
                            fi
                        done
                        if test x"${nut_with_nut_monitor_py2gtk2}" != x"yes" ; then
                            AC_MSG_RESULT([no])
                        fi
                    ])
                ;;
            esac

            if test x"${nut_with_nut_monitor_py2gtk2}" != x"yes" ; then
                if test -n "${PYTHON_FAILED_TEST_DETAILS}" ; then
                    PYTHON_FAILED_TEST_DETAILS="${PYTHON_FAILED_TEST_DETAILS} and some or all of these Python2 modules in default Python: '${PYTHON2_TEST_MODULES}'"
                else
                    PYTHON_FAILED_TEST_DETAILS="Missing some or all of these Python2 modules in default Python: '${PYTHON2_TEST_MODULES}'"
                fi
            fi
        fi
    fi

    AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
        AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_nut_monitor-3: ${nut_with_nut_monitor}])
        AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_nut_monitor_py2gtk2: ${nut_with_nut_monitor_py2gtk2}])
        AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_nut_monitor_py3qt5: ${nut_with_nut_monitor_py3qt5}])
        AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_nut_monitor_py3qt6: ${nut_with_nut_monitor_py3qt6}])
    ])
    dnl Can we satisfy any NUT-Monitor installation request?
    if test -n "${nut_with_nut_monitor_py2gtk2}${nut_with_nut_monitor_py3qt5}${nut_with_nut_monitor_py3qt6}" ; then
        case "${nut_with_nut_monitor}" in
            "auto") nut_with_nut_monitor="yes" ;;
        esac
    else
        case "${nut_with_nut_monitor}" in
            "auto") nut_with_nut_monitor="no" ;;
            "yes")
                AC_MSG_ERROR([No Python 2/3 interpreter with needed modules was found, as required for NUT-Monitor desktop application: ${PYTHON_FAILED_TEST_DETAILS}])
                ;;
        esac
    fi
fi

AC_MSG_CHECKING([if we can and should install NUT-Monitor desktop application])
AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_nut_monitor-4: ${nut_with_nut_monitor}])
])
case "${nut_with_nut_monitor}" in
    "no") if test -n "${PYTHON_FAILED_TEST_DETAILS}" ; then
            AC_MSG_RESULT([${nut_with_nut_monitor}: ${PYTHON_FAILED_TEST_DETAILS}])
        else
            AC_MSG_RESULT([${nut_with_nut_monitor}])
        fi
        ;;
    *) AC_MSG_RESULT([${nut_with_nut_monitor}]) ;;
esac

AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_nut_monitor-5: ${nut_with_nut_monitor}])
])
if test x"${nut_with_nut_monitor}" != xno ; then
    if (command -v desktop-file-install || which desktop-file-install) >/dev/null 2>/dev/null ; then
        case "${nut_with_nut_monitor}" in
            "auto"|"yes") nut_with_nut_monitor_desktop="desktop-file-install" ;;
        esac
    else
        case "${nut_with_nut_monitor}" in
            "yes")  AC_MSG_WARN([Current OS does not seem to provide desktop-file-install])
                nut_with_nut_monitor_desktop="install"
                ;;
            "auto") nut_with_nut_monitor_desktop="install" ;;
        esac
    fi
fi
AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) nut_with_nut_monitor-6: ${nut_with_nut_monitor}])
])

dnl ${nut_with_pynut}: TODO: arg values to request python 2, 3 or both
AC_MSG_CHECKING([if we can and should install PyNUT module])
nut_with_pynut_py=""
nut_with_pynut_py2=""
nut_with_pynut_py3=""
if test x"${nut_with_pynut}" != xno \
    -a -n "${PYTHON}${PYTHON2}${PYTHON3}" \
; then
    if test -n "${PYTHON2}" \
    && (command -v ${PYTHON2} || which ${PYTHON2}) >/dev/null 2>/dev/null \
    ; then
        if ${PYTHON2} -c "import socket" \
        ; then
            nut_with_pynut_py2="yes"
        fi
    fi

    if test -n "${PYTHON3}" \
    && (command -v ${PYTHON3} || which ${PYTHON3}) >/dev/null 2>/dev/null \
    ; then
        if ${PYTHON3} -c "import socket" \
        ; then
            nut_with_pynut_py3="yes"
        fi
    fi

    dnl Test same-ness of pythons with sys.version also?
    if test -n "${PYTHON}" \
    && (command -v ${PYTHON} || which ${PYTHON}) >/dev/null 2>/dev/null \
    && test "${PYTHON}" != "${PYTHON2}" -a "${PYTHON}" != "${PYTHON3}" \
    ; then
        if ${PYTHON} -c "import socket" \
        ; then
            nut_with_pynut_py="yes"
        fi
    fi
fi

if test -z "${nut_with_pynut_py}${nut_with_pynut_py2}${nut_with_pynut_py3}" ; then
    dnl Not all prereqs are available...
    case "${nut_with_pynut}" in
        "auto"|"app")
            if test "${nut_with_nut_monitor}" = yes ; then
                AC_MSG_ERROR([Prerequisites for PyNUT not found, can't install as required for NUT-Monitor desktop application])
            else
                nut_with_pynut="no"
            fi
            ;;
        "yes")
            AC_MSG_ERROR([Prerequisites for PyNUT not found, can't install as required])
            ;;
    esac
fi

if test x"${nut_with_pynut}" != xno ; then
    if test -n "${PYTHON_SITE_PACKAGES}${PYTHON2_SITE_PACKAGES}${PYTHON3_SITE_PACKAGES}" \
    ; then
        dnl retain "app" if requested by caller
        case "${nut_with_pynut}" in
            "auto")
                nut_with_pynut="yes"
                ;;
        esac
    else
        case "${nut_with_pynut}" in
            "auto")
                if test "${nut_with_nut_monitor}" = yes -o "${nut_with_nut_monitor}" = force ; then
                    nut_with_pynut="app"
                else
                    nut_with_pynut="no"
                fi
                ;;
            "yes") dnl Note: this would die for --with-nut_monitor=yes but no site location
                if test "${nut_with_nut_monitor}" = yes -o "${nut_with_nut_monitor}" = force ; then
                    nut_with_pynut="app"
                else
                    AC_MSG_ERROR([Python interpreter and/or its site-packages location not found, but required for PyNUT])
                fi
                ;;
        esac
    fi
fi
AC_MSG_RESULT([${nut_with_pynut}])

dnl Note: do not move up to before pynut processing
if test "${nut_with_nut_monitor}" = force ; then
    AC_MSG_NOTICE([overriding nut_with_nut_monitor=yes because caller forced it])
    nut_with_nut_monitor=yes
    nut_with_nut_monitor_py2gtk2=yes
    nut_with_nut_monitor_py3qt5=yes
    nut_with_nut_monitor_py3qt6=yes
fi

if test "${nut_with_pynut}" = force ; then
    AC_MSG_NOTICE([overriding nut_with_pynut=yes because caller forced it])
    if test "${nut_with_nut_monitor}" = yes ; then
        nut_with_pynut=app
    else
        nut_with_pynut=yes
    fi
fi

NUT_REPORT_PROGRAM([install NUT-Monitor desktop application], [${nut_with_nut_monitor}], [],
					[WITH_NUT_MONITOR], [Define to enable NUT-Monitor desktop application installation])

NUT_REPORT_PROGRAM([install PyNUT binding module], [${nut_with_pynut}], [],
					[WITH_PYNUT], [Define to enable PyNUT module installation])

dnl One or both of these may be installed:
AM_CONDITIONAL(WITH_NUT_MONITOR, test "${nut_with_nut_monitor}" = "yes" && test "${nut_with_nut_monitor_py2gtk2}" = "yes" -o "${nut_with_nut_monitor_py3qt5}" = "yes" -o "${nut_with_nut_monitor_py3qt6}" = "yes")
AM_CONDITIONAL(WITH_NUT_MONITOR_PY2GTK2, test "${nut_with_nut_monitor_py2gtk2}" = "yes")
AM_CONDITIONAL(WITH_NUT_MONITOR_PY3QT5, test "${nut_with_nut_monitor_py3qt5}" = "yes")
AM_CONDITIONAL(WITH_NUT_MONITOR_PY3QT6, test "${nut_with_nut_monitor_py3qt6}" = "yes")
AM_CONDITIONAL(WITH_NUT_MONITOR_PY3QT5_OR_QT6, test "${nut_with_nut_monitor_py3qt5}" = "yes" -o "${nut_with_nut_monitor_py3qt6}" = "yes")

dnl Install PyNUT as a globally usable module, or just as app internals?
AM_CONDITIONAL(WITH_PYNUT_PY,  test "${nut_with_pynut_py}" = "yes"  -a "${nut_with_pynut}" = yes)
AM_CONDITIONAL(WITH_PYNUT_PY2, test "${nut_with_pynut_py2}" = "yes" -a "${nut_with_pynut}" = yes)
AM_CONDITIONAL(WITH_PYNUT_PY3, test "${nut_with_pynut_py3}" = "yes" -a "${nut_with_pynut}" = yes)
AM_CONDITIONAL(WITH_PYNUT_APP, test "${nut_with_pynut}" = "app")

AC_SUBST([nut_with_nut_monitor_dir], [${nut_with_nut_monitor_dir}])
AC_SUBST([nut_with_nut_monitor_py2gtk2], [${nut_with_nut_monitor_py2gtk2}])
AC_SUBST([nut_with_nut_monitor_py3qt5], [${nut_with_nut_monitor_py3qt5}])
AC_SUBST([nut_with_nut_monitor_py3qt6], [${nut_with_nut_monitor_py3qt6}])
AC_SUBST([nut_with_nut_monitor_desktop], [${nut_with_nut_monitor_desktop}])
AC_SUBST([nut_with_nut_monitor], [${nut_with_nut_monitor}])
AC_SUBST([nut_with_pynut], [${nut_with_pynut}])
AC_SUBST([nut_with_pynut_py], [${nut_with_pynut_py}])
AC_SUBST([nut_with_pynut_py2], [${nut_with_pynut_py2}])
AC_SUBST([nut_with_pynut_py3], [${nut_with_pynut_py3}])

dnl MacOS Darwin has a problem with script shebangs, and tends to run anything
dnl with shell. On the upside, it has no limit on length or amount of tokens
dnl in the shebang line.
dnl https://github.com/NixOS/nixpkgs/issues/65351/
AS_CASE([${target_os}],
	[*darwin*], [
		AS_IF([test -n "${PYTHON}"  -a x"${PYTHON}"  != xno], [ PYTHON=" /usr/bin/env ${PYTHON}"])
		AS_IF([test -n "${PYTHON2}" -a x"${PYTHON2}" != xno], [PYTHON2=" /usr/bin/env ${PYTHON2}"])
		AS_IF([test -n "${PYTHON3}" -a x"${PYTHON3}" != xno], [PYTHON3=" /usr/bin/env ${PYTHON3}"])
		AS_IF([test -n "${PYTHON_DEFAULT}"  -a x"${PYTHON_DEFAULT}"  != xno], [PYTHON_DEFAULT=" /usr/bin/env ${PYTHON_DEFAULT}"])
		]
)

AS_IF([test "${nut_with_nut_monitor}" != no -o "${nut_with_pynut}" != no], [
    dnl We do not expose PYTHON_DEFAULT visibly at this time
    NUT_REPORT([use default  Python  interpreter],   [${PYTHON}])
    NUT_REPORT([use specific Python2 interpreter],   [${PYTHON2}])
    NUT_REPORT([use specific Python3 interpreter],   [${PYTHON3}])

    NUT_REPORT_PATH_INTEGRATIONS([Default  Python  interpreter site-packages],
        [${PYTHON_SITE_PACKAGES}])

    NUT_REPORT_PATH_INTEGRATIONS([Specific Python2 interpreter site-packages],
        [${PYTHON2_SITE_PACKAGES}])

    NUT_REPORT_PATH_INTEGRATIONS([Specific Python3 interpreter site-packages],
        [${PYTHON3_SITE_PACKAGES}])
        dnl # Python site-packages installation path for specific Python3 interpreter
])

dnl Avoid "make install" writing to same location twice
AM_CONDITIONAL(PYTHON_SITE_PACKAGES_IS_PY2, test x"${PYTHON_SITE_PACKAGES}" = x"${PYTHON2_SITE_PACKAGES}")
AM_CONDITIONAL(PYTHON_SITE_PACKAGES_IS_PY3, test x"${PYTHON_SITE_PACKAGES}" = x"${PYTHON3_SITE_PACKAGES}")

dnl ----------------------------------------------------------------------
dnl checks related to --enable-cppcheck

dnl Currently this is experimental; maybe change default to auto in the future
dnl At that point, see also defaults in ci_build.sh then (to avoid the workload
dnl unless desired).
NUT_ARG_ENABLE([cppcheck], [Run a cppcheck on the codebase among checks], [no])
NUT_CHECK_CPPCHECK

AC_MSG_CHECKING(whether to run cppcheck among default make check target)
case "${nut_enable_cppcheck}" in
	yes) if test "${nut_have_cppcheck}" = "no" ; then
	        AC_MSG_ERROR([Requested to --enable-cppcheck but did not find a good one])
	     fi
	     WITH_CPPCHECK=yes
	     ;;
	no)  WITH_CPPCHECK=no ;;
	auto) if test "${nut_have_cppcheck}" = "yes" ; then
	        WITH_CPPCHECK=yes
	    else
	        WITH_CPPCHECK=no
	    fi
	    ;;
esac
AC_MSG_RESULT([${WITH_CPPCHECK}])

AM_CONDITIONAL(WITH_CPPCHECK, test "${WITH_CPPCHECK}" = "yes")

dnl ----------------------------------------------------------------------
dnl checks related to --enable-check-NIT

dnl FIXME? Add "auto" to align with development builds?
AC_MSG_CHECKING(whether to run NIT among default make check target)
NUT_ARG_ENABLE([check-NIT], [Run check-NIT among default checks], [no])
AC_MSG_RESULT([${nut_enable_check_NIT}])
AM_CONDITIONAL(WITH_CHECK_NIT, test "${nut_enable_check_NIT}" = "yes")

dnl ----------------------------------------------------------------------
dnl checks related to --enable-spellcheck
dnl NOTE: If the tools are present, you can "make spellcheck" explicitly;
dnl  this setting is about trying or not to run it as part of "make check".

NUT_CHECK_ASPELL
NUT_ARG_ENABLE([spellcheck], [Run spellcheck among default checks], [auto])

AC_MSG_CHECKING(whether to run spellcheck among default make check target)
case "${nut_enable_spellcheck}" in
	yes) if test "${nut_have_aspell}" = "no" ; then
	        AC_MSG_ERROR([Requested to --enable-spellcheck but did not find a good one])
	     fi
	     WITH_SPELLCHECK=yes
	     ;;
	no)  WITH_SPELLCHECK=no ;;
	auto) if test "${nut_have_aspell}" = "yes" ; then
	        WITH_SPELLCHECK=yes
	    else
	        WITH_SPELLCHECK=no
	    fi
	    ;;
esac
AC_MSG_RESULT([${WITH_SPELLCHECK}])

NUT_REPORT_FEATURE([requested to spell-check the documentation], [${WITH_SPELLCHECK}], [],
					[WITH_SPELLCHECK], [Define to enable documentation spell checking as part of default checks], [-])

dnl ----------------------------------------------------------------------
dnl checks related to --with-doc

dnl Always check for AsciiDoc prerequisites, since even if --with-doc
dnl is set to 'no', we may still want to build some doc targets manually
dnl (so enable the Makefile recipes for those targets if tools are available)
NUT_CHECK_ASCIIDOC

DOC_INSTALL_DISTED_MANS=no
DOC_INSTALL_SELECTED_MANS=""
KNOWN_UNABLE_MANS=no

case "${nut_with_doc}" in
	yes|all|all=yes)
		nut_doc_build_list="man html-single html-chunked pdf"
		;;
	auto|all=auto)
		nut_doc_build_list="man=auto html-single=auto html-chunked=auto pdf=auto"
		;;
	skip|all=skip)
		nut_doc_build_list="man=skip html-single=skip html-chunked=skip pdf=skip"
		;;
	dist-auto) # Experimental, currently only for MANs: prefer disted files if present, auto otherwise
		nut_doc_build_list="man=dist-auto html-single=dist-auto html-chunked=dist-auto pdf=dist-auto"
		;;
	no|all=no)
		nut_doc_build_list=""
		;;
dnl If user passed --with-doc='' they they want nothing, right?
	"")
		nut_doc_build_list=""
		AC_MSG_NOTICE([Got explicit empty list of document formats to build; nothing will be generated])
		;;
	*)
		nut_doc_build_list="`echo ${nut_with_doc} | sed 's/,/ /g'`"
		AC_MSG_NOTICE([Got explicit list of document formats to build or not: ${nut_doc_build_list}; formats not listed will be silently skipped])
		;;
esac

NUT_REPORT_FEATURE([requested to build and install documentation], ['${nut_with_doc}' => '${nut_doc_build_list}'], [],
					[WITH_ASCIIDOC], [Define to enable Asciidoc support], [-])

if test -z "${abs_srcdir}" ; then
	case "${srcdir}" in
		/*) abs_srcdir="${srcdir}";;
		"") AC_MSG_ERROR([Can not detect 'srcdir']) ;;
		*)  abs_srcdir="$(cd "${srcdir}" && pwd)" || AC_MSG_ERROR([Can not detect 'srcdir']) ;;
	esac
fi
DOCTESTDIR="$(${MKTEMP} -d configure-test.docbuild.$$.XXXXXXX)" && \
DOCTESTDIR="$(cd "$DOCTESTDIR" && pwd)"

dnl NOTE: We perform some of these checks/infos also if docs=(man=)skip
dnl  so we know in later reports if disted files are still an option
dnl  should we want to not just skip them
have_disted_doc_man=no
want_disted_doc_man=no
if test -s "${abs_srcdir}"/docs/man/snmp-ups.8 ; then
	dnl Test that groff files exist (building from distributed tarball, not git repo)
	if test x"PLACEHOLDER" = x"`cat \"${abs_srcdir}\"/docs/man/snmp-ups.8`" ; then
		dnl REALLY should not happen in real builds,
		dnl but may be in distcheck-driven sub-builds
		dnl where the external build agreed to use
		dnl fake man pages (e.g. for CI recipe checks)
		have_disted_doc_man=yes-placeholder
	else
		have_disted_doc_man=yes
	fi
fi

dnl Note: Do not cover ${nut_doc_build_list} in braces or quotes here,
dnl to ensure that it is processed as several space-separated tokens
for nut_doc_build_target in $nut_doc_build_list; do
	case "${nut_doc_build_target}" in
	*=*=*)	rm -rf "${DOCTESTDIR}"
		AC_MSG_ERROR([Invalid documentation format option: ${nut_doc_build_target}]) ;;
	*=*)
		nut_doc_build_target_base="`echo \"${nut_doc_build_target}\" | sed 's,=.*$,,'`"
		nut_doc_build_target_flag="`echo \"${nut_doc_build_target}\" | sed 's,^.*=,,'`"
		;;
	*)
		nut_doc_build_target_base="${nut_doc_build_target}"
		nut_doc_build_target_flag="yes"
		;;
	esac

	case "${nut_doc_build_target_flag}" in
	yes|no|auto|skip|dist-auto) ;;
	"") nut_doc_build_target_flag="yes" ;;
	*)	rm -rf "${DOCTESTDIR}"
		AC_MSG_ERROR([Invalid documentation format option: ${nut_doc_build_target}]) ;;
	esac

	AC_MSG_CHECKING([desire and ability to build ${nut_doc_build_target_base} documentation])
	AC_MSG_RESULT([${nut_doc_build_target_flag}])

	case "${nut_doc_build_target}" in
	*=no|*=skip)
		DOC_SKIPBUILD_LIST="${DOC_SKIPBUILD_LIST} ${nut_doc_build_target_base}"
		;;

dnl Notes: Document options below assume either no flag value (which
dnl by default means "yes"), "yes" which is a requirement, or "auto"
dnl to detect if we can build the wanted documentation format and yet
dnl not fail if we have no tools to generate it (so add to SKIP list).

	html-single*)
		AC_MSG_CHECKING([if asciidoc and a2x versions can build ${nut_doc_build_target_base} (minimum required asciidoc-${ASCIIDOC_MIN_VERSION} a2x-${A2X_MIN_VERSION})])
		can_build_doc_html_single=no
		AX_COMPARE_VERSION([${ASCIIDOC_VERSION}], [ge], [${ASCIIDOC_MIN_VERSION}], [
			AX_COMPARE_VERSION([${A2X_VERSION}], [ge], [${A2X_MIN_VERSION}], [
				( cd "$DOCTESTDIR" && ${A2X} --attribute=xhtml11_format --format=xhtml --xsl-file="${abs_srcdir}"/docs/xhtml.xsl --destination-dir=. "${abs_srcdir}"/docs/asciidoc.txt && test -s asciidoc.html ) && can_build_doc_html_single=yes
				rm -f "$DOCTESTDIR"/asciidoc*.htm*
			], [])
		], [])
		if test "${can_build_doc_html_single}" = yes ; then
			AC_MSG_RESULT(yes)
			DOC_BUILD_LIST="${DOC_BUILD_LIST} ${nut_doc_build_target_base}"
		else
			AC_MSG_RESULT(no)
			DOC_CANNOTBUILD_LIST="${DOC_CANNOTBUILD_LIST} ${nut_doc_build_target_base}"
			if test "${nut_doc_build_target_flag}" = "yes" ; then
				AC_MSG_WARN([Unable to build ${nut_doc_build_target_base} documentation which you requested; will reflect on this below])
			else
				DOC_SKIPBUILD_LIST="${DOC_SKIPBUILD_LIST} ${nut_doc_build_target_base}"
			fi
		fi
		;;

	html-chunked*)
		AC_MSG_CHECKING([if asciidoc and a2x versions can build ${nut_doc_build_target_base} (minimum required asciidoc-${ASCIIDOC_MIN_VERSION} a2x-${A2X_MIN_VERSION})])
		can_build_doc_html_chunked=no
		AX_COMPARE_VERSION([${ASCIIDOC_VERSION}], [ge], [${ASCIIDOC_MIN_VERSION}], [
			AX_COMPARE_VERSION([${A2X_VERSION}], [ge], [${A2X_MIN_VERSION}], [
				( cd "$DOCTESTDIR" && ${A2X} --attribute=chunked_format --format=chunked --xsl-file="${abs_srcdir}"/docs/chunked.xsl --destination-dir=. "${abs_srcdir}"/docs/FAQ.txt && test -s FAQ.chunked/index.html ) && can_build_doc_html_chunked=yes
				rm -rf "${DOCTESTDIR}"/FAQ*.chunked*
			], [])
		], [])
		if test "${can_build_doc_html_chunked}" = yes ; then
			AC_MSG_RESULT(yes)
			DOC_BUILD_LIST="${DOC_BUILD_LIST} ${nut_doc_build_target_base}"
		else
			AC_MSG_RESULT(no)
			DOC_CANNOTBUILD_LIST="${DOC_CANNOTBUILD_LIST} ${nut_doc_build_target_base}"
			if test "${nut_doc_build_target_flag}" = "yes" ; then
				AC_MSG_WARN([Unable to build ${nut_doc_build_target_base} documentation which you requested; will reflect on this below])
			else
				DOC_SKIPBUILD_LIST="${DOC_SKIPBUILD_LIST} ${nut_doc_build_target_base}"
			fi
		fi
		;;

	pdf*)
		AC_MSG_CHECKING([if dblatex version can build ${nut_doc_build_target_base} (minimum required ${DBLATEX_MIN_VERSION})])
		can_build_doc_pdf=no
		can_build_doc_pdf_nonascii_titles=no
		AX_COMPARE_VERSION([${DBLATEX_VERSION}], [ge], [${DBLATEX_MIN_VERSION}], [
			( cd "$DOCTESTDIR" && ${A2X} --format=pdf --destination-dir=. "${abs_srcdir}"/docs/asciidoc.txt && test -s asciidoc.pdf ) && can_build_doc_pdf=yes
			rm -f "${DOCTESTDIR}"/asciidoc.pdf
		], [])
		if test "${can_build_doc_pdf}" = yes ; then
			AC_MSG_RESULT(yes)
			DOC_BUILD_LIST="${DOC_BUILD_LIST} ${nut_doc_build_target_base}"
			AC_MSG_CHECKING([if dblatex can process non-ASCII section titles for PDF])
			( cd "$DOCTESTDIR" && sed -e 's/^Intro/'"`printf '\303\215'`"'ntro/' -e 's/Works in Progress/Works '"`printf '\303\255'`"'n Progress/' < "${abs_srcdir}"/docs/asciidoc.txt > asciidoc.tmp.txt && ${A2X} --format=pdf --destination-dir=. asciidoc.tmp.txt && test -s asciidoc.tmp.pdf ) && can_build_doc_pdf_nonascii_titles=yes
			rm -f "${DOCTESTDIR}"/asciidoc.tmp.pdf
			AC_MSG_RESULT(${can_build_doc_pdf_nonascii_titles})
		else
			AC_MSG_RESULT(no)
			DOC_CANNOTBUILD_LIST="${DOC_CANNOTBUILD_LIST} ${nut_doc_build_target_base}"
			if test "${nut_doc_build_target_flag}" = "yes" ; then
				AC_MSG_WARN([Unable to build ${nut_doc_build_target_base} documentation which you requested; will reflect on this below])
			else
				DOC_SKIPBUILD_LIST="${DOC_SKIPBUILD_LIST} ${nut_doc_build_target_base}"
			fi
		fi
		;;

	man*)
		dnl Experimental support for --with-doc=man=dist-auto to prefer pre-disted docs if available, below
		AC_MSG_CHECKING([if we can build ${nut_doc_build_target_base}])
		can_build_doc_man=no
		if test x"${nut_doc_build_target}" = x"man=dist-auto" || test x"${nut_doc_build_target_flag}" = x"dist-auto"; then
			want_disted_doc_man=yes
		fi
		if test "${nut_have_asciidoc}" = yes ; then
			( cd "$DOCTESTDIR" && ${A2X} --format manpage --destination-dir=. --xsltproc-opts="--nonet" "${abs_srcdir}"/docs/man/snmp-ups.txt && test -s snmp-ups.8 ) && can_build_doc_man=yes
			rm -f "${DOCTESTDIR}"/snmp-ups.8
		fi
		if test x"${can_build_doc_man}" != xyes && test x"${have_disted_doc_man}" = xyes && test x"${nut_doc_build_target_flag}" != xno ; then
			dnl https://github.com/networkupstools/nut/issue/3314
			AC_MSG_NOTICE([Seems we can not build man pages, but have some pre-built ones...])
			dnl want_disted_doc_man=yes
		fi
		can_install_doc_man=no
		if test "${want_disted_doc_man}" = yes && ( test "${have_disted_doc_man}" = yes || test "${have_disted_doc_man}" = yes-placeholder ) ; then
			AC_MSG_NOTICE([Requested, and can, install pre-built distributed copies of ${nut_doc_build_target_base} documentation])
			DOC_SKIPBUILD_LIST="${DOC_SKIPBUILD_LIST} ${nut_doc_build_target_base}"
			DOC_INSTALL_DISTED_MANS="yes"
			dnl Avoid rebuilding existing build products due to their timestamp dependencies;
			dnl ignore "touch" errors due to e.g. read-only sources (distcheck, ISO image, etc.):
			touch -r "${abs_srcdir}"/docs/man/Makefile.am "${abs_srcdir}"/docs/man/*.{1,2,3,4,5,6,7,8,9}* "${abs_srcdir}"/docs/man/*.{txt,xml,html,pdf} || true
			can_install_doc_man=yes
		else
			if test "${can_build_doc_man}" = yes ; then
				AC_MSG_RESULT(yes)
				AS_IF([test x"${nut_doc_build_target_base}" = xman],
					dnl Use "man-man" target, otherwise Makefile
					dnl is satisfied that directory "man" exists:
					[DOC_BUILD_LIST="${DOC_BUILD_LIST} man-man"],
					[DOC_BUILD_LIST="${DOC_BUILD_LIST} ${nut_doc_build_target_base}"])
				can_install_doc_man=yes
			else
				AC_MSG_RESULT(no)
				DOC_CANNOTBUILD_LIST="${DOC_CANNOTBUILD_LIST} ${nut_doc_build_target_base}"
				KNOWN_UNABLE_MANS=yes
				if test "${nut_doc_build_target_flag}" = "yes" ; then
					AC_MSG_WARN([Unable to build ${nut_doc_build_target_base} documentation which you requested; will reflect on this below])
				else
					DOC_SKIPBUILD_LIST="${DOC_SKIPBUILD_LIST} ${nut_doc_build_target_base}"
					case "${nut_doc_build_target_flag}" in
					no|skip) ;;
					auto|dist-auto)
						if test "${have_disted_doc_man}" = yes || test "${have_disted_doc_man}" = yes-placeholder ; then
							AC_MSG_WARN([Unable to build ${nut_doc_build_target_base} documentation, but can install pre-built distributed copies])
							DOC_INSTALL_DISTED_MANS="yes"
							dnl Avoid rebuilding existing build products due to their timestamp dependencies;
							dnl ignore "touch" errors due to e.g. read-only sources (distcheck, ISO image, etc.):
							touch -r "${abs_srcdir}"/docs/man/Makefile.am "${abs_srcdir}"/docs/man/*.{1,2,3,4,5,6,7,8,9}* "${abs_srcdir}"/docs/man/*.{txt,xml,html,pdf} || true
							can_install_doc_man=yes
						else
							AC_MSG_WARN([Unable to build ${nut_doc_build_target_base} documentation, and unable to install pre-built distributed copies because they are absent; will reflect on this below])
						fi
						;;
					*)
						AC_MSG_ERROR([Unexpected flag value '${nut_doc_build_target_flag}' for ${nut_doc_build_target_base} documentation])
						;;
					esac
				fi
			fi
		fi

		if test "${can_install_doc_man}" = yes ; then
			case "${nut_enable_docs_man_for_progs_built_only}" in
			yes)
				dnl Legacy default for auto builds: build/deliver only mans for built progs:
				DOC_INSTALL_SELECTED_MANS="mans-progs-built"
				;;
			no)
				DOC_INSTALL_SELECTED_MANS="mans-progs-all"
				;;
			esac
		fi
		;;

	*)	rm -rf "${DOCTESTDIR}"
		AC_MSG_ERROR([--with-doc option refers to unknown documentation format: $nut_doc_build_target]) ;;

	esac
done
rm -rf "${DOCTESTDIR}"

AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) DOC_BUILD_LIST:            '${DOC_BUILD_LIST}'])
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) DOC_CANNOTBUILD_LIST:      '${DOC_CANNOTBUILD_LIST}'])
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) DOC_SKIPBUILD_LIST:        '${DOC_SKIPBUILD_LIST}'])
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) DOC_INSTALL_DISTED_MANS:   '${DOC_INSTALL_DISTED_MANS}'])
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) DOC_INSTALL_SELECTED_MANS: '${DOC_INSTALL_SELECTED_MANS}'])
])

case "${nut_with_doc}" in
auto)
	if test -n "${DOC_BUILD_LIST}"; then
		dnl # We can build at least one format...
		nut_with_doc="yes"
	else
		dnl # We can not build any formats...
		nut_with_doc="no"
	fi
	;;
no)
	;;
*)  dnl # yes, all, skip...
	if test -n "${DOC_CANNOTBUILD_LIST}"; then
		DOC_CANNOTBUILD_LIST_LINES="`echo \"${DOC_CANNOTBUILD_LIST}\" | tr ' ' '\n' | ${EGREP} -v '^$'`"
		for DOCTYPE in ${nut_doc_build_list} ; do
			if echo "${DOC_CANNOTBUILD_LIST_LINES}" | ${EGREP} "^${DOCTYPE}(=yes)?\$" >/dev/null 2>/dev/null ; then
				AC_MSG_ERROR([Unable to build${DOC_CANNOTBUILD_LIST} documentation (check for 'no' results above)])
			else if echo "${DOC_CANNOTBUILD_LIST_LINES}" | ${EGREP} "^${DOCTYPE}=(skip|auto|dist-auto)\$" >/dev/null 2>/dev/null ; then
				AC_MSG_NOTICE([Unable to build${DOC_CANNOTBUILD_LIST} documentation (check for 'no' results above), skipping])
				fi
			fi
		done
	fi

	if test -n "${DOC_SKIPBUILD_LIST}"; then
		AC_MSG_NOTICE([Skipping build of${DOC_SKIPBUILD_LIST} documentation (check for 'skip' results above)])
	fi

	if test -n "${DOC_BUILD_LIST}"; then
		nut_with_doc="yes"
	else
		nut_with_doc="no"
	fi
	;;
esac

AM_CONDITIONAL(WITH_PDF_NONASCII_TITLES, [test x"$can_build_doc_pdf_nonascii_titles" = xyes])

NUT_REPORT_FEATURE([would build specific documentation format(s)], [${nut_with_doc}], [${DOC_BUILD_LIST} ${DOC_INSTALL_SELECTED_MANS}],
					[WITH_DOCS], [Define to enable overall documentation generation], [-])

# To cater for less portable make's, precalculate the target list
# for "make check" in "docs/" here...
DOC_CHECK_LIST=""
if test "${nut_with_doc}" = yes ; then
	for V in $DOC_BUILD_LIST ; do
		if test x"$V" = xman-man ; then V=man ; fi
		DOC_CHECK_LIST="$DOC_CHECK_LIST check-$V"
	done
fi

WITH_MANS=no
SKIP_MANS=no
if echo "${DOC_BUILD_LIST}" | ${GREP} -w "man" >/dev/null || test "${DOC_INSTALL_DISTED_MANS}" = "yes" ; then
	WITH_MANS=yes
fi
if echo "${DOC_SKIPBUILD_LIST}" | ${GREP} -w "man" >/dev/null ; then
	SKIP_MANS=yes
fi
if echo "${DOC_CANNOTBUILD_LIST}" | ${GREP} -w "man" >/dev/null ; then
	KNOWN_UNABLE_MANS=yes
fi
dnl Generally WITH_MANS=no is intentionally fatal for "make distcheck"
dnl But some larger distcheck suites check mans once and then focus on
dnl other aspects of the project, so they can explicitly skip docs (or
dnl just mans) instead. Note that for WITH_MANS=yes the SKIP_MANS value
dnl is effectively ignored by docs/man/Makefile.am at this time.
AM_CONDITIONAL(WITH_MANS, test "${WITH_MANS}" = "yes")
AM_CONDITIONAL(SKIP_MANS, test "${SKIP_MANS}" = "yes")
AM_CONDITIONAL(KNOWN_UNABLE_MANS, test "${KNOWN_UNABLE_MANS}" = "yes")
AM_CONDITIONAL(DOC_INSTALL_DISTED_MANS, test "${DOC_INSTALL_DISTED_MANS}" = "yes")
dnl TOTHINK: Expand more flexibly? Currently we either (build and) install
dnl  all known man pages, or only those for programs we currently build,
dnl  so a boolean-ish toggle suffices.
dnl AM_CONDITIONAL(DOC_INSTALL_SELECTED_MANS_PROGS_ALL, test x"${DOC_INSTALL_SELECTED_MANS}" = x"mans-progs-all")
AM_CONDITIONAL(DOC_INSTALL_SELECTED_MANS_PROGS_BUILT, test x"${DOC_INSTALL_SELECTED_MANS}" = x"mans-progs-built")
dnl Reporting have_disted_doc_man not DOC_INSTALL_DISTED_MANS because the former has more values
AS_IF([test x"${have_disted_doc_man}" = x], [have_disted_doc_man="did not check"])
NUT_REPORT([can install pre-built documentation (release/dist tarball)], ["${have_disted_doc_man}"])

WITH_HTML_SINGLE=no
SKIP_HTML_SINGLE=no
if echo "${DOC_BUILD_LIST}" | ${GREP} -w "html-single" >/dev/null ; then
	WITH_HTML_SINGLE=yes
fi
if echo "${DOC_SKIPBUILD_LIST}" | ${GREP} -w "html-single" >/dev/null ; then
	SKIP_HTML_SINGLE=yes
fi
AM_CONDITIONAL(WITH_HTML_SINGLE, test "${WITH_HTML_SINGLE}" = "yes")
AM_CONDITIONAL(SKIP_HTML_SINGLE, test "${SKIP_HTML_SINGLE}" = "yes")

WITH_HTML_CHUNKED=no
SKIP_HTML_CHUNKED=no
if echo "${DOC_BUILD_LIST}" | ${GREP} -w "html-chunked" >/dev/null ; then
	WITH_HTML_CHUNKED=yes
fi
if echo "${DOC_SKIPBUILD_LIST}" | ${GREP} -w "html-chunked" >/dev/null ; then
	SKIP_HTML_CHUNKED=yes
fi
AM_CONDITIONAL(WITH_HTML_CHUNKED, test "${WITH_HTML_CHUNKED}" = "yes")
AM_CONDITIONAL(SKIP_HTML_CHUNKED, test "${SKIP_HTML_CHUNKED}" = "yes")

WITH_PDFS=no
SKIP_PDFS=no
if echo "${DOC_BUILD_LIST}" | ${GREP} -w "pdf" >/dev/null ; then
	WITH_PDFS=yes
fi
if echo "${DOC_SKIPBUILD_LIST}" | ${GREP} -w "pdf" >/dev/null ; then
	SKIP_PDFS=yes
fi
AM_CONDITIONAL(WITH_PDFS, test "${WITH_PDFS}" = "yes")
AM_CONDITIONAL(SKIP_PDFS, test "${SKIP_PDFS}" = "yes")

dnl # NUT ChangeLog* files can consume a lot of build time,
dnl # so we want to let developers skip (re-)building them
dnl # if they enable docs and then iterate their code base.
WITH_CHANGELOG_TEXT=no
WITH_CHANGELOG_ADOC=no
WITH_CHANGELOG_HTML_SINGLE=no
WITH_CHANGELOG_HTML_CHUNKED=no
WITH_CHANGELOG_PDF=no

dnl # Correlate "auto" with some measure of development iterations (quick) vs. release/tarball build (full). Can maintainer-mode be it?
AS_IF([($NUT_SOURCE_GITREV_IS_RELEASE || $NUT_SOURCE_GITREV_IS_PRERELEASE) && test "${nut_enable_docs_changelog}" = auto],
	[
	 dnl # CI systems struggle to build a release commit, for now do not require this bit:
	 dnl # https://github.com/networkupstools/nut/issues/3053
	 AC_MSG_NOTICE([This is a (pre-)release build and original --enable-docs-changelog=${nut_enable_docs_changelog} -- consider setting to "yes"])
	 dnl # AC_MSG_NOTICE([Enabling WITH_CHANGELOG_*=yes because this is a (pre-)release build and original --enable-docs-changelog=${nut_enable_docs_changelog}])
	 dnl # nut_enable_docs_changelog=yes
	]
)

case "${nut_enable_docs_changelog}" in
	no|skip)	AC_MSG_NOTICE([Requested to not enable WITH_CHANGELOG_*])
		;;
	yes)
		AS_IF([test "${nut_with_doc}" != yes], [AC_MSG_ERROR([Can not enable WITH_CHANGELOG_* due to build settings or environment])])
		WITH_CHANGELOG_TEXT=yes
		WITH_CHANGELOG_ADOC=yes
		AS_IF([test "${WITH_HTML_SINGLE}" = "yes" -a "${SKIP_HTML_SINGLE}" = no],
			[WITH_CHANGELOG_HTML_SINGLE=yes],
			[AC_MSG_ERROR([Can not enable WITH_CHANGELOG_HTML_SINGLE due to build settings or environment])])
		AS_IF([test "${WITH_HTML_CHUNKED}" = "yes" -a "${SKIP_HTML_CHUNKED}" = no],
			[WITH_CHANGELOG_HTML_CHUNKED=yes],
			[AC_MSG_ERROR([Can not enable WITH_CHANGELOG_HTML_CHUNKED due to build settings or environment])])
		AS_IF([test "${WITH_PDFS}" = "yes" -a "${SKIP_PDFS}" = no],
			[WITH_CHANGELOG_PDF=yes],
			[AC_MSG_ERROR([Can not enable WITH_CHANGELOG_PDF due to build settings or environment])])
		;;
	auto|yes=auto|"")
		AS_IF([test "${nut_with_doc}" = yes], [
			WITH_CHANGELOG_TEXT=yes
			WITH_CHANGELOG_ADOC=yes
			AS_IF([test "${WITH_HTML_SINGLE}" = "yes" -a "${SKIP_HTML_SINGLE}" = no],
				[WITH_CHANGELOG_HTML_SINGLE=yes],
				[WITH_CHANGELOG_HTML_SINGLE=no
				 AC_MSG_WARN([Can not enable WITH_CHANGELOG_HTML_SINGLE due to build settings or environment])
				])
			AS_IF([test "${WITH_HTML_CHUNKED}" = "yes" -a "${SKIP_HTML_CHUNKED}" = no],
				[WITH_CHANGELOG_HTML_CHUNKED=yes],
				[WITH_CHANGELOG_HTML_CHUNKED=no
				 AC_MSG_WARN([Can not enable WITH_CHANGELOG_HTML_CHUNKED due to build settings or environment])
				])
			AS_IF([test "${WITH_PDFS}" = "yes" -a "${SKIP_PDFS}" = no],
				[WITH_CHANGELOG_PDF=yes],
				[WITH_CHANGELOG_PDF=no
				 AC_MSG_WARN([Can not enable WITH_CHANGELOG_PDF due to build settings or environment])
				])
		], [
			AC_MSG_WARN([Can not enable WITH_CHANGELOG_* due to build settings or environment])
		])
		;;
	*)
		AS_IF([test "${nut_with_doc}" = yes], [

			dnl # Check each complex format desire independently:
			case "${nut_enable_docs_changelog}" in
			html-single=no*|*,html-single=no*|html-single=skip*|*,html-single=skip*) ;;
			html-single*|*,html-single*)
			AS_IF([test "${WITH_HTML_SINGLE}" = "yes" -a "${SKIP_HTML_SINGLE}" = no],
				[WITH_CHANGELOG_HTML_SINGLE=yes],
				[WITH_CHANGELOG_HTML_SINGLE=no
				 case "${nut_enable_docs_changelog}" in
				    *html-single=auto*)	AC_MSG_WARN([Can not enable WITH_CHANGELOG_HTML_SINGLE due to build settings or environment]) ;;
				    *)	AC_MSG_ERROR([Can not enable WITH_CHANGELOG_HTML_SINGLE due to build settings or environment]) ;;
				 esac
				])
			;; esac

			case "${nut_enable_docs_changelog}" in
			html-chunked=no*|*,html-chunked=no*|html-chunked=skip*|*,html-chunked=skip*) ;;
			html-chunked*|*,html-chunked*)
			AS_IF([test "${WITH_HTML_CHUNKED}" = "yes" -a "${SKIP_HTML_CHUNKED}" = no],
				[WITH_CHANGELOG_HTML_CHUNKED=yes],
				[WITH_CHANGELOG_HTML_CHUNKED=no
				 case "${nut_enable_docs_changelog}" in
				    *html-chunked=auto*)	AC_MSG_WARN([Can not enable WITH_CHANGELOG_HTML_CHUNKED due to build settings or environment]) ;;
				    *)	AC_MSG_ERROR([Can not enable WITH_CHANGELOG_HTML_CHUNKED due to build settings or environment]) ;;
				 esac
				])
			;; esac

			case "${nut_enable_docs_changelog}" in
			pdf=no*|*,pdf=no*|pdf=skip*|*,pdf=skip*) ;;
			pdf*|*,pdf*)
			AS_IF([test "${WITH_PDFS}" = "yes" -a "${SKIP_PDFS}" = no],
				[WITH_CHANGELOG_PDF=yes],
				[WITH_CHANGELOG_PDF=no
				 case "${nut_enable_docs_changelog}" in
				    *pdf=auto*)	AC_MSG_WARN([Can not enable WITH_CHANGELOG_PDF due to build settings or environment]) ;;
				    *)	AC_MSG_ERROR([Can not enable WITH_CHANGELOG_PDF due to build settings or environment]) ;;
				 esac
				])
			;; esac

			case "${nut_enable_docs_changelog}" in
			adoc=no*|*,adoc=no*)
				AS_IF([test "${WITH_HTML_SINGLE}${WITH_CHANGELOG_HTML_CHUNKED}${WITH_CHANGELOG_PDF}" != "nonono"],
					[AC_MSG_ERROR([Can not disable WITH_CHANGELOG_ADOC when HTML and/or PDF build is required])])
				;;
			adoc=yes*|*,adoc=yes*|adoc|adoc,*|*,adoc|*,adoc,*)	dnl Require enabled
				WITH_CHANGELOG_ADOC=yes
				;;
			adoc=skip*|*,adoc=skip*|adoc=auto*|*,adoc=auto*|*)
				AS_IF([test "${WITH_HTML_SINGLE}${WITH_CHANGELOG_HTML_CHUNKED}${WITH_CHANGELOG_PDF}" = "nonono"],
					[WITH_CHANGELOG_ADOC=no],
					[case "${nut_enable_docs_changelog}" in
					 *adoc=skip*)
						AC_MSG_WARN([Can not disable WITH_CHANGELOG_ADOC when HTML and/or PDF build is required, so enabling it])
						;;
					 esac
					 WITH_CHANGELOG_ADOC=yes
					])
				;;
			esac

			WITH_CHANGELOG_TEXT=yes
			case "${nut_enable_docs_changelog}" in
			text=no|*,text=no)
				AS_IF([test "${WITH_CHANGELOG_ADOC}${WITH_HTML_SINGLE}${WITH_CHANGELOG_HTML_CHUNKED}${WITH_CHANGELOG_PDF}" != "nononono"],
					[AC_MSG_ERROR([Can not disable WITH_CHANGELOG_TEXT when ADOC, HTML and/or PDF build is required])])
				WITH_CHANGELOG_TEXT=no
				;;
			text=skip|*,text=skip)
				AS_IF([test "${WITH_CHANGELOG_ADOC}${WITH_HTML_SINGLE}${WITH_CHANGELOG_HTML_CHUNKED}${WITH_CHANGELOG_PDF}" = "nononono"],
					[WITH_CHANGELOG_TEXT=no]
					[AC_MSG_WARN([Can not disable WITH_CHANGELOG_TEXT when ADOC, HTML and/or PDF build is required, so enabling it])])
				;;
			esac
		], [
			AC_MSG_WARN([Can not enable WITH_CHANGELOG_* due to build settings or environment])
		])
		;;
esac

AM_CONDITIONAL(WITH_CHANGELOG_TEXT, test "${WITH_CHANGELOG_TEXT}" = "yes")
AM_CONDITIONAL(WITH_CHANGELOG_ADOC, test "${WITH_CHANGELOG_ADOC}" = "yes")
AM_CONDITIONAL(WITH_CHANGELOG_HTML_SINGLE, test "${WITH_CHANGELOG_HTML_SINGLE}" = "yes")
AM_CONDITIONAL(WITH_CHANGELOG_HTML_CHUNKED, test "${WITH_CHANGELOG_HTML_CHUNKED}" = "yes")
AM_CONDITIONAL(WITH_CHANGELOG_PDF, test "${WITH_CHANGELOG_PDF}" = "yes")

case "${nut_with_docs_changelog_start}" in
	yes|no|skip|"")
		AC_MSG_WARN([Option value --with-docs-changelog-start='${nut_with_docs_changelog_start}' is not supported, switching to 'auto'])
		nut_with_docs_changelog_start=auto
		;;
esac

case "${nut_with_docs_changelog_start}" in
	auto)
		AS_IF([$NUT_SOURCE_GITREV_IS_RELEASE || $NUT_SOURCE_GITREV_IS_PRERELEASE || test x"${NUT_SOURCE_GITREV_NUMERIC}" = x],
			[dnl # NUT v2.6.0 is the oldest release with asciidoc rendered into PDF
			 GITLOG_START_POINT=v2.6.0
			],
			[dnl # Try to cut off from preceding release tag (as known in this git workspace index)
			 GITLOG_START_POINT=v"`echo \"${NUT_SOURCE_GITREV_NUMERIC}\" | sed -e 's/^\(@<:@0-9@:>@*\.@<:@0-9@:>@*\.@<:@0-9@:>@*\)@<:@^0-9@:>@*.*$/\1/'`" \
			 && test x"${GITLOG_START_POINT}" != xv \
			 || GITLOG_START_POINT="master"
			])
		;;
	*) dnl # Else assume this is a git hash/tag/branch...
		GITLOG_START_POINT="${nut_with_docs_changelog_start}"
		;;
esac

case "${nut_with_docs_changelog_end}" in
	yes|no|skip|""|auto)	GITLOG_END_POINT=HEAD ;;
	*)	GITLOG_END_POINT="${nut_with_docs_changelog_end}" ;;
esac

NUT_REPORT([would generate ChangeLog* file formats], [text:${WITH_CHANGELOG_TEXT} adoc:${WITH_CHANGELOG_ADOC} html-single:${WITH_CHANGELOG_HTML_SINGLE} html-chunked:${WITH_CHANGELOG_HTML_CHUNKED} pdf:${WITH_CHANGELOG_PDF} starting from '${GITLOG_START_POINT}' to '${GITLOG_END_POINT}'])

dnl NOTE: Sections may be strings, not pure numbers, on some platforms:
MAN_SECTION_API="${nut_with_docs_man_section_api}"
MAN_SECTION_CFG="${nut_with_docs_man_section_cfg}"
MAN_SECTION_CMD_SYS="${nut_with_docs_man_section_cmd_sys}"
MAN_SECTION_CMD_USR="${nut_with_docs_man_section_cmd_usr}"
MAN_SECTION_MISC="${nut_with_docs_man_section_misc}"

MAN_SECTION_API_BASE="`echo \"${MAN_SECTION_API}\" | sed 's/^\(@<:@0-9@:>@*\)@<:@^0-9@:>@.*$/\1/'`"
MAN_SECTION_CFG_BASE="`echo \"${MAN_SECTION_CFG}\" | sed 's/^\(@<:@0-9@:>@*\)@<:@^0-9@:>@.*$/\1/'`"
MAN_SECTION_CMD_SYS_BASE="`echo \"${MAN_SECTION_CMD_SYS}\" | sed 's/^\(@<:@0-9@:>@*\)@<:@^0-9@:>@.*$/\1/'`"
MAN_SECTION_CMD_USR_BASE="`echo \"${MAN_SECTION_CMD_USR}\" | sed 's/^\(@<:@0-9@:>@*\)@<:@^0-9@:>@.*$/\1/'`"
MAN_SECTION_MISC_BASE="`echo \"${MAN_SECTION_MISC}\" | sed 's/^\(@<:@0-9@:>@*\)@<:@^0-9@:>@.*$/\1/'`"

dnl Full man page section IDs (e.g. '1m', '8')
AC_DEFINE_UNQUOTED([MAN_SECTION_API], ["${MAN_SECTION_API}"], [man page section for library APIs])
AC_DEFINE_UNQUOTED([MAN_SECTION_CFG], ["${MAN_SECTION_CFG}"], [man page section for configuration files])
AC_DEFINE_UNQUOTED([MAN_SECTION_CMD_SYS], ["${MAN_SECTION_CMD_SYS}"], [man page section for system management commands])
AC_DEFINE_UNQUOTED([MAN_SECTION_CMD_USR], ["${MAN_SECTION_CMD_USR}"], [man page section for user commands])
AC_DEFINE_UNQUOTED([MAN_SECTION_MISC], ["${MAN_SECTION_MISC}"], [man page section for overviews, conventions, and miscellaneous])

dnl Base (number only) man page section IDs (e.g. '1', '8')
AC_DEFINE_UNQUOTED([MAN_SECTION_API_BASE], ["${MAN_SECTION_API_BASE}"], [base (number only) man page section for library APIs])
AC_DEFINE_UNQUOTED([MAN_SECTION_CFG_BASE], ["${MAN_SECTION_CFG_BASE}"], [base (number only) man page section for configuration files])
AC_DEFINE_UNQUOTED([MAN_SECTION_CMD_SYS_BASE], ["${MAN_SECTION_CMD_SYS_BASE}"], [base (number only) man page section for system management commands])
AC_DEFINE_UNQUOTED([MAN_SECTION_CMD_USR_BASE], ["${MAN_SECTION_CMD_USR_BASE}"], [base (number only) man page section for user commands])
AC_DEFINE_UNQUOTED([MAN_SECTION_MISC_BASE], ["${MAN_SECTION_MISC_BASE}"], [base (number only) man page section for overviews, conventions, and miscellaneous])

AC_SUBST(MAN_SECTION_API)
AC_SUBST(MAN_SECTION_CFG)
AC_SUBST(MAN_SECTION_CMD_SYS)
AC_SUBST(MAN_SECTION_CMD_USR)
AC_SUBST(MAN_SECTION_MISC)

AC_SUBST(MAN_SECTION_API_BASE)
AC_SUBST(MAN_SECTION_CFG_BASE)
AC_SUBST(MAN_SECTION_CMD_SYS_BASE)
AC_SUBST(MAN_SECTION_CMD_USR_BASE)
AC_SUBST(MAN_SECTION_MISC_BASE)

MAN_DIR_AS_BASE="${nut_with_docs_man_dir_as_base}"
AC_DEFINE_UNQUOTED([MAN_DIR_AS_BASE], ["${MAN_DIR_AS_BASE}"], [are platform man directories named by base number (yes) or full section name (no)])
AM_CONDITIONAL(MAN_DIR_AS_BASE, test "${MAN_DIR_AS_BASE}" = "yes")
AC_SUBST(MAN_DIR_AS_BASE)

dnl FIXME: handle "no" in a way to not link to distro man pages?
dnl FIXME: spread out default templates per platform/distro some more
dnl NOTE: FreeBSD default URLs use a query string, with an ampersand,
dnl  which is hard to render for both docbook and man pages:
dnl  https://man.freebsd.org/cgi/man.cgi?query={target}&sektion={0}
dnl  Luckily, they have a fallback.
AC_MSG_CHECKING([asciidoc template to use for linkmanext macro])
AS_CASE([${nut_with_docs_man_linkmanext_template}],
	[auto|yes|""|no], [AS_CASE([${target_os}],
		[solaris*|sunos*|SunOS*|illumos*], [ASCIIDOC_TEMPLATE_LINKMANEXT='https://docs.oracle.com/cd/E86824_01/html/E54763/{target}-{0}.html'],
		[freebsd*], [ASCIIDOC_TEMPLATE_LINKMANEXT='https://man.freebsd.org/cgi/man.cgi?{target}({0})'],
		[openbsd*], [ASCIIDOC_TEMPLATE_LINKMANEXT='https://man.openbsd.org/man{0}/{target}.{0}'],
			[ASCIIDOC_TEMPLATE_LINKMANEXT='https://linux.die.net/man/{0}/{target}'])],
		[ASCIIDOC_TEMPLATE_LINKMANEXT="${nut_with_docs_man_linkmanext_template}"])
AC_SUBST([ASCIIDOC_TEMPLATE_LINKMANEXT])
AC_MSG_RESULT([${ASCIIDOC_TEMPLATE_LINKMANEXT}])

AC_MSG_CHECKING([asciidoc template to use for linkmanext2 macro])
AS_CASE([${nut_with_docs_man_linkmanext2_template}],
	[auto|yes|""|no], [AS_CASE([${target_os}],
		[solaris*|sunos*|SunOS*|illumos*], [ASCIIDOC_TEMPLATE_LINKMANEXT2='https://docs.oracle.com/cd/E86824_01/html/E54763/{target}-{2}.html'],
		[freebsd*], [ASCIIDOC_TEMPLATE_LINKMANEXT2='https://man.freebsd.org/cgi/man.cgi?{target}({2})'],
		[openbsd*], [ASCIIDOC_TEMPLATE_LINKMANEXT2='https://man.openbsd.org/man{2}/{target}.{2}'],
			[ASCIIDOC_TEMPLATE_LINKMANEXT2='https://linux.die.net/man/{2}/{target}'])],
		[ASCIIDOC_TEMPLATE_LINKMANEXT2="${nut_with_docs_man_linkmanext2_template}"])
AC_SUBST([ASCIIDOC_TEMPLATE_LINKMANEXT2])
AC_MSG_RESULT([${ASCIIDOC_TEMPLATE_LINKMANEXT2}])

AC_MSG_CHECKING([whether to rewrite man page sections in linkmanext* macro URLs])
AS_CASE([${nut_docs_man_linkmanext_section_rewrite}],
	[yes|""], [ASCIIDOC_LINKMANEXT_SECTION_REWRITE="yes"],
	[no], [ASCIIDOC_LINKMANEXT_SECTION_REWRITE="no"],
	[auto], [AS_IF([test "${MAN_SECTION_API}${MAN_SECTION_CFG}${MAN_SECTION_CMD_SYS}${MAN_SECTION_CMD_USR}${MAN_SECTION_MISC}" = x35817],
			[ASCIIDOC_LINKMANEXT_SECTION_REWRITE="no"],
			[ASCIIDOC_LINKMANEXT_SECTION_REWRITE="yes"])
		],
		[ASCIIDOC_LINKMANEXT_SECTION_REWRITE="yes"]
	)
AM_CONDITIONAL(ASCIIDOC_LINKMANEXT_SECTION_REWRITE, [test "${ASCIIDOC_LINKMANEXT_SECTION_REWRITE}" = yes])
AC_SUBST(ASCIIDOC_LINKMANEXT_SECTION_REWRITE)
AC_MSG_RESULT([${ASCIIDOC_LINKMANEXT_SECTION_REWRITE}])

dnl ----------------------------------------------------------------------
dnl checks related to --with-dev

dnl We only init libtool there to allow AC_DISABLE_STATIC
if ( test "${GCC}" = "yes" )
then
	dnl # Avoid new compilers' warnings/errors about libtool distro flaws in this test like:
	dnl #   error: ISO C forbids conversion of function pointer to object pointer type [-Werror=pedantic]
	dnl #   {"nm_test_func", (void *) &nm_test_func},
	dnl # or ones about LTO (-flto -fno-common) as discussed and suggested
	dnl # in https://www.mail-archive.com/libtool@gnu.org/msg14037.html -
	dnl # all leading to undefined "global_symbol_pipe" in the generated
	dnl # libtool script, and resulting in errors like `... | | ...` below :
	dnl # libtool: link: /usr/bin/nm -B .libs/upsclient.o \
	dnl #   ../common/.libs/libcommonclient.a |  | /usr/bin/sed 's/.* //' \
	dnl #   | sort | uniq > .libs/libupsclient.exp
	dnl # ../libtool: syntax error: `|' unexpected

	CFLAGS_SAVED_NOPEDANTIC="$CFLAGS"
	AS_CASE(["${CFLAGS}"],[*"-pedantic"*],[CFLAGS="${CFLAGS} -Wno-pedantic"])
	AS_CASE(["${CFLAGS}"],[*"-Werror"*],[CFLAGS="${CFLAGS} -Wno-error"])
	AS_CASE(["${CFLAGS}"],[*"-flto"*],[CFLAGS="${CFLAGS} -ffat-lto-objects"])
fi

dnl See https://www.gnu.org/software/libtool/manual/html_node/LT_005fINIT.html
dnl #OBSOLETED:# LT_INIT and AC_PROG_LIBTOOL

dnl # Hack around the libtool script: as of version 58 (current in 2021),
dnl # they use code like below to detect library paths:
dnl #   if test yes = "$GCC"; then ... lt_search_path_spec=`$CC -print-search-dirs | ...
dnl # which explodes when non-default architecture is used for the build,
dnl # where e.g. "CC=gcc" and "CFLAGS=-m32" on a 64-bit capable system.
dnl # And similarly for compilation-checks to link third-party libraries.
SAVED_GCC="$GCC"
SAVED_CC="$CC"
if ( test "${GCC}" = "yes" )
then
    case "$CFLAGS$LDFLAGS" in
        *-m32*) CC="$CC -m32" ;;
        *-m64*) CC="$CC -m64" ;;
    esac
fi
m4_ifdef([AM_PROG_AR], [AM_PROG_AR])

dnl # NOTE: This also initializes `hardcode_libdir_flag_spec` and
dnl # `hardcode_libdir_flag_spec_CXX` that we use in LDFLAGS_NUT_RPATH
LT_INIT

AC_SUBST([LIBTOOL_DEPS])
GCC="$SAVED_GCC"
CC="$SAVED_CC"

if ( test "${GCC}" = "yes" )
then
	CFLAGS="$CFLAGS_SAVED_NOPEDANTIC"
fi

dnl ${nut_with_dev}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_dev}" != "no"; then
  nut_with_dev="yes"
else
  AC_DISABLE_STATIC
fi
AM_CONDITIONAL(WITH_DEV, test "${nut_with_dev}" = "yes")
NUT_REPORT_FEATURE([build and install the development files], [${nut_with_dev}], [],
					[WITH_DEV], [Define to enable development files support])

dnl Since 2.7.x releases, NUT binaries have grown rather large on many
dnl platforms. Maybe this is due to more and more libcommon* methods?
dnl Tracked at https://github.com/networkupstools/nut/issues/2800
dnl While we had never shared internal code this way (and probably need
dnl to stress it is not a public API/ABI), most NUT binaries are already
dnl dynamically linked wither with libupsclient or third-party code.
AC_MSG_CHECKING(if requested shared internal libraries)
NUT_ARG_ENABLE([shared-private-libs], [ENABLE_SHARED_PRIVATE_LIBS], [Dynamically link to NUT libcommon* libraries delivered once, instead of building used code into each program binary], [no])

dnl For now basically cover yes/no/auto
dnl FIXME: Somehow determine whether we can do this at all,
dnl for proper failure on "yes" if we can't vs. not-failing
dnl but rather switching to "no" for "auto"?
AS_CASE([${nut_enable_shared_private_libs}],
	[""|yes], [nut_enable_shared_private_libs="yes"],
	[auto], [nut_enable_shared_private_libs="yes"],
	[no], [],
		[AC_MSG_ERROR([invalid option value --enable-shared-private-libs='${nut_enable_shared_private_libs}'])]
)
AC_MSG_RESULT([${nut_enable_shared_private_libs}])
AM_CONDITIONAL(ENABLE_SHARED_PRIVATE_LIBS, test "${nut_enable_shared_private_libs}" = "yes"])
NUT_REPORT_FEATURE([dynamically link to NUT common libraries instead of copying needed bits into each binary], [${nut_enable_shared_private_libs}], [],
					[ENABLE_SHARED_PRIVATE_LIBS], [Define to dynamically link to NUT common libraries instead of copying needed bits into each binary])

dnl ----------------------------------------------------------------------
dnl checks related to MS Windows support (MingW)

AC_CHECK_TOOL([WINDMC], [windmc], [none])
AC_CHECK_TOOL([WINDRES], [windres], [none])

if test "x$WINDMC" != "xnone" -a "x$WINDRES" != "xnone" ; then
	nut_have_mingw_resgen="yes"
fi

AM_CONDITIONAL([HAVE_MINGW_RESGEN], [test "${nut_have_mingw_resgen}" = "yes"])

dnl Also define a generic automake condition for general Windows compilation:
dnl do we at least have the header file(s) we require for the platform
dnl (more files may be optional e.g. for different generations of networking)
dnl Could just use ..._COND_IF([HAVE_WINDOWS_H],... but it is not present in
dnl some older versions of autotools. (Note autoconf expands in comments too).
AS_IF([test "x$nut_cv_header_windows_h" = xyes],
	[AM_CONDITIONAL([HAVE_WINDOWS], [test "${nut_have_mingw_resgen}" = "yes"])],
	[AM_CONDITIONAL([HAVE_WINDOWS], [false])]
	)


dnl ----------------------------------------------------------------------
dnl Bits and pieces of NUT build artifacts' installation locations

PREFIX="${prefix}"
NUT_REPORT_SETTING_PATH([Default installation prefix path],
    PREFIX, "${prefix}", [Default installation prefix path])

dnl ---------------------------------------------------------------------
dnl Note: long ago in NUT history drivers and upsd exchanges state files
dnl Now socket files live there for similar but more efficient effect.
AC_MSG_CHECKING(if requested state path)
NUT_ARG_WITH([statepath], [DIRPATH], [Path for UPS driver state (socket) files], [m4nut_DEFAULT_STATEPATH])

AS_CASE([${nut_with_statepath}],
	[yes|no|""], [AC_MSG_ERROR(invalid option --with(out)-statepath - see docs/configure.txt)],
	["${STATEPATH}"|m4nut_DEFAULT_STATEPATH], [AC_MSG_RESULT([default])],
		[AC_MSG_RESULT([specified])]
)
STATEPATH="${nut_with_statepath}"
NUT_REPORT_SETTING_PATH([State file path],
    STATEPATH, "${STATEPATH}", [Path for UPS driver state (socket) files])

dnl ---------------------------------------------------------------------
dnl The 'alt pid path' is used by the drivers (via main.c) and upsd, since
dnl ideally they do not run as root and will not be able to write to the usual
dnl /var/run path.  This defaults to the STATEPATH since they should be
dnl able to write there.
dnl

AC_MSG_CHECKING(if requested alt pid path)
NUT_ARG_WITH_EXPAND_DEFAULT_HELP_SINGLEQUOTE([altpidpath], [DIRPATH], [Path for .pid files of NUT driver/upsd not running as root], [\${STATEPATH}])

AS_CASE([${nut_with_altpidpath}],
	[yes|no|""], [AC_MSG_ERROR(invalid option --with(out)-altpidpath - see docs/configure.txt)],
	[${STATEPATH}|\${STATEPATH}], [AC_MSG_RESULT([default])],
		[AC_MSG_RESULT([specified])]
)
conftemp="${nut_with_altpidpath}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
ALTPIDPATH="${conftemp}"
NUT_REPORT_SETTING_PATH([Unprivileged PID file path],
    ALTPIDPATH, "${ALTPIDPATH}", [Path for pid files of processes not running as root, such as drivers and upsd (usually STATEPATH)])

dnl ---------------------------------------------------------------------
dnl Recommended: a sub-directory of (/var)/run as long as we can create
dnl and chown+chmod it before starting NUT daemons.

AC_MSG_CHECKING(if requested pidpath)
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([pidpath], [DIRPATH], [Path for root-owned NUT process .pid files], [auto], [platform-dependent, usually m4nut_DEFAULT_PIDPATH])

AS_CASE([${nut_with_pidpath}],
	[yes|no|""], [AC_MSG_ERROR(invalid option --with(out)-pidpath - see docs/configure.txt)],
	[auto], [AC_MSG_RESULT([default])],	dnl Keep what we chose above in the script (/var/run or /run)
		[AC_MSG_RESULT([specified])
		 PIDPATH="${nut_with_pidpath}"]
)
NUT_REPORT_SETTING_PATH([Privileged PID file path],
    PIDPATH, "${PIDPATH}", [Path for pid files of processes running as root, such as upsmon])

dnl --------------------------------------------------------------------
dnl Legacy default was /etc/killpower, but modern distros may prefer some
dnl temporary filesystem (no I/O storage device impact) as long as it is
dnl mounted at least read-only late in shutdown routine. The upsmon program
dnl writes it as root, so this may well be in /var/run or in NUT PID/state
dnl path (if that location remains mounted in run-time OS distribution).
dnl Ideally the filesystems with `upsmon` program and libraries it needs
dnl also remain mounted, so `upsmon -K` may be queried late in shutdown -
dnl and we can avoid hardcoding such paths into those shutdown hooks.
dnl Note that upsmon removes this file early in any daemonized start-up.
dnl Keep in mind that upsmon requires the value to be actually defined
dnl in its own config file, if we want to use late end-game UPS poweroff.
dnl Otherwise that code path is skipped.
AC_MSG_CHECKING(if requested default upsmon POWERDOWNFLAG path)
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([powerdownflag], [FILEPATH], [Default path for upsmon POWERDOWNFLAG file, often '/etc/killpower' but recommended to be under some tmpfs],
	[auto], [platform-dependent: /etc/killpower on POSIX systems, C:\killpower on Windows])

AS_CASE([${nut_with_powerdownflag}],
	[yes|no|""], [AC_MSG_ERROR(invalid option --with(out)-powerdownflag - see docs/configure.txt)],
	[auto], [AC_MSG_RESULT([default])],
		[POWERDOWNFLAG="${nut_with_powerdownflag}"
		 AC_MSG_RESULT([specified])]
)

dnl # This should be internal detail for "upsmon -K" implementation,
dnl # so not necessarily reported (reduce noise):
dnl NUT_REPORT_SETTING_PATH([Default upsmon POWERDOWNFLAG path],
dnl    POWERDOWNFLAG, "${POWERDOWNFLAG}", [Default path for upsmon POWERDOWNFLAG file])

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING(if requested driver path)
NUT_ARG_WITH_EXPAND_DEFAULT_HELP_SINGLEQUOTE([drvpath], [DIRPATH], [Where to install UPS driver programs, often EPREFIX/bin, but recommended to be a subdir of '${libexecdir}'], [m4nut_DEFAULT_DRVPATH])

AS_CASE([${nut_with_drvpath}],
	[yes|no|""], [AC_MSG_ERROR(invalid option --with(out)-drvpath - see docs/configure.txt)],
	[m4nut_DEFAULT_DRVPATH], [AC_MSG_RESULT([default])],
		[AC_MSG_RESULT([specified])]
)
dnl Raw value for Makefile automated install rules
driverexecdir="${nut_with_drvpath}"

dnl Resolved value
conftemp="${driverexecdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
DRVPATH="${conftemp}"
NUT_REPORT_SETTING_PATH([Driver program path],
    DRVPATH, "${conftemp}", [Default path for UPS drivers])

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING(if requested CGI program path)
NUT_ARG_WITH_EXPAND_DEFAULT_HELP_SINGLEQUOTE([cgipath], [DIRPATH], [Where to install CGI programs, distros may want it in a location dictated by web server software], [m4nut_DEFAULT_CGIEXECPATH])

AS_CASE([${nut_with_cgipath}],
	[yes|no|""], [AC_MSG_ERROR(invalid option --with(out)-cgipath - see docs/configure.txt)],
	[m4nut_DEFAULT_CGIEXECPATH], [AC_MSG_RESULT([default])],
		[AC_MSG_RESULT([specified])]
)
dnl Raw value for Makefile automated install rules
cgiexecdir="${nut_with_cgipath}"

dnl Resolved value
conftemp="${cgiexecdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
CGIEXECPATH="${conftemp}"
NUT_REPORT_SETTING_PATH([CGI program path],
    CGIEXECPATH, "${conftemp}", [Default path for CGI programs])

dnl ---------------------------------------------------------------------
dnl FIXME: Make it an alias for a new --with-htmlcgipath
AC_MSG_CHECKING(if requested CGI HTML resource path)
NUT_ARG_WITH_EXPAND_DEFAULT_HELP_SINGLEQUOTE([htmlpath], [DIRPATH], [Where to install CGI HTML resource files, distros may want it in a location dictated by web server software], [m4nut_DEFAULT_CGIDATAPATH])

AS_CASE([${nut_with_htmlpath}],
	[yes|no|""], [AC_MSG_ERROR(invalid option --with(out)-htmlpath - see docs/configure.txt)],
	[m4nut_DEFAULT_CGIDATAPATH], [AC_MSG_RESULT([default])],
		[AC_MSG_RESULT([specified])]
)
dnl Raw value for Makefile automated install rules
htmlcgidir="${nut_with_htmlpath}"

dnl Resolved value
conftemp="${htmlcgidir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
CGIDATAPATH="${conftemp}"
NUT_REPORT_SETTING_PATH([HTML file path],
    CGIDATAPATH, "${conftemp}", [Default path for HTML files (CGI templates)])

dnl ---------------------------------------------------------------------
dnl Other NUT build/install customization options
AC_MSG_CHECKING(network port number)
NUT_ARG_WITH([port], [PORTNUM], [port for network communications], [3493])

AS_IF([(test 0 -lt "${nut_with_port}" && test 65536 -gt "${nut_with_port}") 2>/dev/null],
	[NUT_PORT="${nut_with_port}"],
	[AC_MSG_ERROR(invalid option --with(out)-port - see docs/configure.txt)]
)
AC_MSG_RESULT(${NUT_PORT})
AC_DEFINE_UNQUOTED(NUT_PORT, ${NUT_PORT}, [Port for NUT network communications])

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING(facility for syslog)
NUT_ARG_WITH([logfacility], [FACILITY], [syslog facility for log messages], [LOG_DAEMON])
AS_CASE([${nut_with_logfacility}],
	[yes|no|""], [AC_MSG_ERROR(invalid option --with(out)-logfacility - see docs/configure.txt)],
		[LOGFACILITY="${nut_with_logfacility}"]
)
AC_MSG_RESULT(${LOGFACILITY})
AC_DEFINE_UNQUOTED(LOG_FACILITY, ${LOGFACILITY}, [Desired syslog facility - see syslog(3)])

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING(which driver man pages to install)
DRIVER_MAN_LIST_PAGES=""
if test "${WITH_MANS}" = "yes"; then
	if test "${DRIVER_BUILD_LIST}" = "all"; then
		DRIVER_MAN_LIST=all
		AC_MSG_RESULT(all available)
	else
		DRIVER_MAN_LIST=""
		for i in ${DRIVER_BUILD_LIST}; do
		    dnl See if source or pre-generated (tarball) doc file exists:
			if test -f ${srcdir}/docs/man/$i.txt -o -f ${srcdir}/docs/man/$i.8; then
				DRIVER_MAN_LIST="${DRIVER_MAN_LIST} $i.8"
				DRIVER_MAN_LIST_PAGES="${DRIVER_MAN_LIST_PAGES} $i.txt"
			fi
		done
		AC_MSG_RESULT(${DRIVER_MAN_LIST})
	fi
else
	DRIVER_MAN_LIST=""
	AC_MSG_RESULT([none (manpages disabled)])
fi

dnl ---------------------------------------------------------------------
dnl By default as we iterate (and git commit) the codebase during development,
dnl prerequisites for that header file change and cause much of the C code
dnl to be rebuilt and re-linked. For developers fixing one small part of the
dnl project after another (*and* committing fixes as they go on), the version
dnl string reported by their new binaries may be of lesser consequence than
dnl iterating *quickly* and rebuiding just what "really" changed!
dnl Still, this speed-up is not default to avoid surprises for core team.
AC_MSG_CHECKING(whether to force nut_version.h generation for every make run)
dnl Value is "FORCE" or empty, substituted into Makefile.am rule:
NUT_ARG_ENABLE([force-nut-version-header], [Force nut_version.h generation for every make run?], [yes])
AS_CASE([${nut_enable_force_nut_version_header}],
	[no], [
		AC_MSG_RESULT(no)
		FORCE_NUT_VERSION=""
	], [
		AC_MSG_RESULT(yes)
		FORCE_NUT_VERSION="FORCE"
	])


dnl ---------------------------------------------------------------------
AC_MSG_CHECKING(whether to strip debug symbols)
NUT_ARG_ENABLE([strip], [Strip debugging symbols from binaries? Some packaging policies require this...], [no])

AS_CASE([${nut_enable_strip}],
	[no], [AC_MSG_RESULT(no)],
		[AS_IF([test "${CLANGCC}" = "yes" || test "${GCC}" = "yes"],
			[AC_MSG_RESULT(yes)
			 CFLAGS="${CFLAGS} -s"],
			[AS_IF([test "${nut_enable_strip}" = yes],
				[AC_MSG_ERROR([Do not know how to request debug symbol stripping with currently chosen compiler])]
			)]
		)]
)

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING(whether to install pkg-config *.pc files)
NUT_ARG_WITH_EXPAND_DEFAULT_HELP_SINGLEQUOTE([pkgconfig-dir], [(DIRPATH|yes|no|auto)], [Whether/where to install pkg-config *.pc files, typically EPREFIX/lib/pkgconfig], [m4nut_DEFAULT_PKGCONFIGDIR])

AS_CASE([${nut_with_pkgconfig_dir}],
	[yes|auto|""], [pkgconfigdir='m4nut_DEFAULT_PKGCONFIGDIR'],
	[no], [pkgconfigdir=""],
		[pkgconfigdir="${nut_with_pkgconfig_dir}"]
)

dnl Note: currently pkgconfigdir='${libdir}/pkgconfig' literally
dnl goes into lib/Makefile.am substitution for pkgconfig_DATA.
dnl By default we get ${libdir}/pkgconfig and below expand it to
dnl => ${exec_prefix}/lib/pkgconfig => ${prefix}/lib/pkgconfig => real path
conftemp="${pkgconfigdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
PKGCONFIGDIR="${conftemp}"

if test -n "${pkgconfigdir}"; then
	AC_MSG_RESULT(using ${pkgconfigdir} => ${conftemp})
	NUT_REPORT_PATH_INTEGRATIONS([pkg-config *.pc directory], [${pkgconfigdir} => ${conftemp}])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL(WITH_PKG_CONFIG, test -n "${pkgconfigdir}")

dnl ---------------------------------------------------------------------
dnl Only check the option here (and show in help near pkg-config)
dnl See LDFLAGS_NUT_RPATH determination further below
NUT_ARG_ENABLE([ldflags-nut-rpath],
    [Suggest linker flags for NUT C library consumers to set RPATH for uncommon location],
    [auto])

NUT_ARG_ENABLE([ldflags-nut-rpath-cxx],
    [Suggest linker flags for NUT C++ library consumers to set RPATH for uncommon location],
    [auto])

dnl ---------------------------------------------------------------------
dnl Options for Solaris/illumos `make install` and `make package`
AC_MSG_CHECKING(whether to make Solaris SVR4 packages)
NUT_ARG_WITH([solaris-pkg-svr4], [(yes|no|auto)], [Enable construction of Solaris SVR4 packages], [auto])

AS_CASE([${nut_with_solaris_pkg_svr4}],
	[auto|""], [solarispkg_svr4="auto"],
	[yes|no], [solarispkg_svr4="${nut_with_solaris_pkg_svr4}"],
		[AC_MSG_ERROR([Unexpected argument for --with-solaris-pkg-svr4=${nut_with_solaris_pkg_svr4}])]
)

AS_CASE([${solarispkg_svr4}],
	[no], [],
		[AS_IF([test -x /usr/bin/pkgtrans && test -x /usr/bin/pkgmk && test -x /usr/bin/pkgproto],
			[AS_CASE([${solarispkg_svr4}],
				[auto], [solarispkg_svr4="yes"]
			 )],
			[AS_CASE([${solarispkg_svr4}],
				[auto], [solarispkg_svr4="no"],
				[yes], [AC_MSG_ERROR([Can not fulfill --with-solaris-pkg-svr4 in the current build environment])]
			 )]
		)]
)
AC_MSG_RESULT([${solarispkg_svr4}])
AM_CONDITIONAL(WITH_SOLARIS_PKG_SVR4, test x"$solarispkg_svr4" = x"yes")

dnl WARNING: this is not currently implemented!
dnl Consider porting OpenIndiana (or eventually OmniOS) build recipes; see e.g.
dnl https://github.com/OpenIndiana/oi-userland/tree/oi/hipster/components/sysutils/nut
AC_MSG_CHECKING(whether to make Solaris IPS packages)
NUT_ARG_WITH([solaris-pkg-ips], [(yes|no|auto)], [Enable construction of Solaris IPS packages (PLACEHOLDER!)], [auto])

AS_CASE([${nut_with_solaris_pkg_ips}],
	[auto|""], [solarispkg_ips="auto"],
	[yes|no], [solarispkg_ips="${nut_with_solaris_pkg_ips}"],
		[AC_MSG_ERROR([Unexpected argument for --with-solaris-pkg-ips=${nut_with_solaris_pkg_ips}])]
)

AS_CASE([${solarispkg_ips}],
	[no], [],
		[AS_IF([test -x /usr/bin/pkg && test -x /usr/bin/pkgmogrify && test -x /usr/bin/pkgdepend],
			[AS_CASE([${solarispkg_ips}],
				[auto], [solarispkg_ips="yes"]
			 )],
			[AS_CASE([${solarispkg_ips}],
				[auto], [solarispkg_ips="no"],
				[yes], [AC_MSG_ERROR([Can not fulfill --with-solaris-pkg-ips in the current build environment])]
			 )]
		)]
)
AC_MSG_RESULT([${solarispkg_ips}])
AM_CONDITIONAL(WITH_SOLARIS_PKG_IPS, test x"$solarispkg_ips" = x"yes")


dnl NOTE: Be sure to customize e.g.  --datadir=/usr/share/nut to install
dnl these scripts not into default location as e.g. /usr/share/solaris-smf
solarissmf=""
solarisinit=""
AC_MSG_CHECKING(whether to install Solaris SMF files)
NUT_ARG_WITH([solaris-smf], [(yes|no|auto)], [Enable installation of NUT scripts and manifests for Solaris Service Management Framework], [auto])

AS_CASE([${nut_with_solaris_smf}],
	[auto|""], [solarissmf="auto"],
	[yes|no], [solarissmf="${nut_with_solaris_smf}"],
		[AC_MSG_ERROR([Unexpected argument for --with-solaris-smf=${nut_with_solaris_smf}])]
)

AS_CASE([${solarissmf}],
	[no], [],
		[AS_IF([test -x /usr/sbin/svcadm && test -x /usr/sbin/svccfg && test -x /usr/bin/svcs],
			[solarissmf="yes"],	dnl yes/auto and got the tools => yes
			[AS_CASE([${solarispkg_ips}${solarispkg_svr4}],
				[*yes*], [AS_IF([test "${solarissmf}" = yes], [AC_MSG_ERROR([Can not fulfill --with-solaris-smf in the current build environment])])
					 solarisinit="yes"],	dnl Older distro requested/detected, so we would want to install INIT SCRIPTS at least, so we can generally package NUT
					[solarissmf="no"]	dnl Target not solarish
			)]
		)]
)
AC_MSG_RESULT([${solarissmf}])
NUT_REPORT_FEATURE([consider basic SMF support], [${solarissmf}], [],
					[WITH_SOLARIS_SMF], [Define to consider basic SMF support (provide units and configuration files)])


AC_MSG_CHECKING(whether to install Solaris SVR4 (legacy) init-script files)
NUT_ARG_WITH([solaris-init], [(yes|no|auto)], [Enable installation of NUT legacy init-scripts for Solaris/illumos], [auto])

AS_CASE([${nut_with_solaris_init}],
	[auto|""], [AS_IF([test x"${solarisinit}" = x], [solarisinit="auto"])],
	[yes|no], [solarisinit="${nut_with_solaris_init}"],
		[AC_MSG_ERROR([Unexpected argument for --with-solaris-init=${nut_with_solaris_init}])]
)

AS_IF([test x"$solarisinit" = xauto],
	[dnl Depends on usability of SMF or making for packaging
	 AS_CASE([${solarispkg_ips}${solarispkg_svr4}],
		[*yes*], [solarisinit="yes"],	dnl Want to install so we can generally package, even if IPS/SMF is present on build host
			[AS_CASE([${target_os}],
				[solaris*|sunos*|SunOS*|illumos*],
					[AS_IF([test x"${solarissmf}" = x"yes"],
						[dnl No need on modern OSes, can use SMF instead
						 solarisinit="no"],
						[solarisinit="yes"]
					)],
					[solarisinit="no"]	dnl Some other OS
			)]
	)]
)
AC_MSG_RESULT([${solarisinit}])
AM_CONDITIONAL(WITH_SOLARIS_INIT, test x"$solarisinit" = x"yes")


dnl ---------------------------------------------------------------------
dnl Note: Currently there is no reliable automatic detection -
dnl users have to ask they want systemd units installed, or
dnl risk auto-detection like seen below.
dnl FIXME: Add a toggle like "--with(out)-systemd" to disable these probes too
AC_MSG_CHECKING(whether to install systemd unit files)
NUT_ARG_WITH([systemdsystemunitdir], [(DIRPATH|yes|no|auto)], [Directory for systemd service files], [auto])
systemdsystemunitdir="${nut_with_systemdsystemunitdir}"

case "${systemdsystemunitdir}" in
	yes|auto|"")
		AS_IF([test x"$have_PKG_CONFIG" = xyes],
			[def_systemdsystemunitdir="`$PKG_CONFIG --variable=systemdsystemunitdir systemd 2>/dev/null`" && test -n "$def_systemdsystemunitdir" || \
			 def_systemdsystemunitdir="`$PKG_CONFIG --variable=systemdsystemunitdir libsystemd 2>/dev/null`" || def_systemdsystemunitdir=""],
			[def_systemdsystemunitdir=""])

		AS_IF([test x"${def_systemdsystemunitdir}" = x], [
			AS_IF([test "${systemdsystemunitdir}" = yes],
				[AC_MSG_ERROR([--with-systemdsystemunitdir=${systemdsystemunitdir} was requested, but PKG_CONFIG could not be queried for the system settings])])
			systemdsystemunitdir=""
			], [systemdsystemunitdir="${def_systemdsystemunitdir}"])

		unset def_systemdsystemunitdir
		;;
	no)
		systemdsystemunitdir=""
		;;
	*)
		AS_IF([test -d "${systemdsystemunitdir}"], [],
			[AC_MSG_WARN([--with-systemdsystemunitdir='${systemdsystemunitdir}' was requested, but that location does not currently exist in build environment - just so you know...])])
		;;
esac
if test "${systemdsystemunitdir}" = "auto" ; then systemdsystemunitdir=""; fi
if test -n "${systemdsystemunitdir}"; then
	have_systemd="yes"
	AC_MSG_RESULT(using ${systemdsystemunitdir})
	NUT_REPORT_PATH_INTEGRATIONS([Service units for systemd], [${systemdsystemunitdir}])
else
	have_systemd="no"
	AC_MSG_RESULT(no)
fi
dnl Note: we may want tighter integration, e.g. systemd-notify support
dnl configured as a further option/flag (see --with-systemd below).
dnl This one is a very basic yes/no toggle for unit file delivery.
NUT_REPORT_FEATURE([consider basic systemd support], [${have_systemd}], [],
					[HAVE_SYSTEMD], [Define to consider basic systemd support (provide units and configuration files)])
dnl This option is only provided so that make distcheck can override it,
dnl otherwise we ask pkg-config whenever --with-systemdsystemunitdir is
dnl given

AC_PATH_PROG([SYSTEMD_SYSTEMCTL_PROGRAM], [systemctl], [/usr/bin/systemctl])

dnl Similarly for presets (list of svcs enabled/disabled by default)
AC_MSG_CHECKING(whether to install systemd preset files)
NUT_ARG_WITH([systemdsystempresetdir], [(DIRPATH|yes|no|auto)], [Directory for systemd preset files], [auto])
systemdsystempresetdir="${nut_with_systemdsystempresetdir}"

dnl Note: this option is enabled only if systemdsystemunitdir is not trivial
if test -n "${systemdsystemunitdir}"; then
	case "${systemdsystempresetdir}" in
	yes|auto|"")
		AS_IF([test x"$have_PKG_CONFIG" = xyes],
			[def_systemdsystempresetdir="`$PKG_CONFIG --variable=systemdsystempresetdir systemd 2>/dev/null`" && test -n "$def_systemdsystempresetdir" || \
			 def_systemdsystempresetdir="`$PKG_CONFIG --variable=systemdsystempresetdir libsystemd 2>/dev/null`" || def_systemdsystempresetdir=""],
			[def_systemdsystempresetdir=""])

		AS_IF([test x"${def_systemdsystempresetdir}" = x], [
			AS_IF([test "${systemdsystempresetdir}" = yes],
				[AC_MSG_ERROR([--with-systemdsystempresetdir=${systemdsystempresetdir} was requested, but PKG_CONFIG could not be queried for the system settings])])
			systemdsystempresetdir=""
			], [systemdsystempresetdir="${def_systemdsystempresetdir}"])

		unset def_systemdsystempresetdir
		;;
	no)
		systemdsystempresetdir=""
		;;
	*)
		AS_IF([test -d "${systemdsystempresetdir}"], [],
			[AC_MSG_WARN([--with-systemdsystempresetdir='${systemdsystempresetdir}' was requested, but that location does not currently exist in build environment - just so you know...])])
		;;
	esac
fi
if test "${systemdsystempresetdir}" = "auto" ; then systemdsystempresetdir=""; fi
if test -n "${systemdsystempresetdir}"; then
	AC_MSG_RESULT(using ${systemdsystempresetdir})
	NUT_REPORT_PATH_INTEGRATIONS([Service unit presets for systemd], [${systemdsystempresetdir}])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL([WITH_SYSTEMD_PRESET], [test x"${systemdsystempresetdir}" != "x"])

dnl Similarly for shutdown integration hooks
AC_MSG_CHECKING(whether to install systemd shutdown files)
NUT_ARG_WITH([systemdshutdowndir], [(DIRPATH|yes|no|auto)], [Directory for systemd shutdown scripts], [auto])
systemdshutdowndir="${nut_with_systemdshutdowndir}"

dnl Note: this option is enabled only if systemdsystemunitdir is not trivial
if test -n "${systemdsystemunitdir}"; then
	case "${systemdshutdowndir}" in
	yes|auto|"")
		AS_IF([test x"$have_PKG_CONFIG" = xyes],
			[def_systemdshutdowndir="`$PKG_CONFIG --variable=systemdshutdowndir systemd 2>/dev/null`" && test -n "$def_systemdshutdowndir" || \
			 def_systemdshutdowndir="`$PKG_CONFIG --variable=systemdshutdowndir libsystemd 2>/dev/null`" || def_systemdshutdowndir=""],
			[def_systemdshutdowndir=""])

		AS_IF([test x"${def_systemdshutdowndir}" = x], [
			AS_IF([test "${systemdshutdowndir}" = yes],
				[AC_MSG_ERROR([--with-systemdshutdowndir=${systemdshutdowndir} was requested, but PKG_CONFIG could not be queried for the system settings])])
			systemdshutdowndir=""
			], [systemdshutdowndir="${def_systemdshutdowndir}"])

		unset def_systemdshutdowndir
		;;
	no)
		systemdshutdowndir=""
		;;
	*)
		AS_IF([test -d "${systemdshutdowndir}"], [],
			[AC_MSG_WARN([--with-systemdshutdowndir='${systemdshutdowndir}' was requested, but that location does not currently exist in build environment - just so you know...])])
		;;
	esac
fi
if test "${systemdshutdowndir}" = "auto" ; then systemdshutdowndir=""; fi
if test -n "${systemdshutdowndir}"; then
	AC_MSG_RESULT(using ${systemdshutdowndir})
	NUT_REPORT_PATH_INTEGRATIONS([Shutdown hooks for systemd], [${systemdshutdowndir}])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL([WITH_SYSTEMD_SHUTDOWN], [test x"${systemdshutdowndir}" != "x"])

dnl Note: if (systemd-)tmpfiles tech is present, it can be useful even for
dnl daemons starting not as systemd units, to pre-create /var/run/nut etc.
AC_MSG_CHECKING([whether to install systemd tmpfiles files])
NUT_ARG_WITH([systemdtmpfilesdir], [(DIRPATH|yes|no|auto)], [Directory for systemd tmpfiles scripts], [auto])
systemdtmpfilesdir="${nut_with_systemdtmpfilesdir}"

case "${systemdtmpfilesdir}" in
	yes|auto|"")
		AS_IF([test x"$have_PKG_CONFIG" = xyes],
			[def_systemdtmpfilesdir="`$PKG_CONFIG --variable=tmpfilesdir systemd 2>/dev/null`" && test -n "$def_systemdtmpfilesdir" || \
			 def_systemdtmpfilesdir="`$PKG_CONFIG --variable=tmpfilesdir libsystemd 2>/dev/null`" || def_systemdtmpfilesdir=""],
			[def_systemdtmpfilesdir=""])

		AS_IF([test x"${def_systemdtmpfilesdir}" = x], [
			AS_IF([test "${systemdtmpfilesdir}" = yes],
				[AC_MSG_ERROR([--with-systemdtmpfilesdir=${systemdtmpfilesdir} was requested, but PKG_CONFIG could not be queried for the system settings])])
			systemdtmpfilesdir=""
			], [systemdtmpfilesdir="${def_systemdtmpfilesdir}"])

		unset def_systemdtmpfilesdir
		;;
	no)
		systemdtmpfilesdir=""
		;;
	*)
		AS_IF([test -d "${systemdtmpfilesdir}"], [],
			[AC_MSG_WARN([--with-systemdtmpfilesdir='${systemdtmpfilesdir}' was requested, but that location does not currently exist in build environment - just so you know...])])
		;;
esac
if test "${systemdtmpfilesdir}" = "auto" ; then systemdtmpfilesdir=""; fi
if test -n "${systemdtmpfilesdir}"; then
	AC_MSG_RESULT(using ${systemdtmpfilesdir})
	NUT_REPORT_PATH_INTEGRATIONS([Systemd-tmpfiles configs], [${systemdtmpfilesdir}])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL([WITH_SYSTEMD_TMPFILES], [test x"${systemdtmpfilesdir}" != "x"])

dnl What pathname would we embed into unit files ExecStartPre?
dnl TODO? Any need to make it a --with-... argument?
AC_PATH_PROG([SYSTEMD_TMPFILES_PROGRAM], [systemd-tmpfiles], [/usr/bin/systemd-tmpfiles])

dnl Note: same as (systemd-)tmpfiles
AC_MSG_CHECKING([whether to install sysusers.d files])
NUT_ARG_WITH([systemdsysusersdir], [(DIRPATH|yes|no|auto)], [Directory for systemd sysusers.d scripts], [auto])
systemdsysusersdir="${nut_with_systemdsysusersdir}"

case "${systemdsysusersdir}" in
	yes|auto|"")
		AS_IF([test x"$have_PKG_CONFIG" = xyes],
			[def_systemdsysusersdir="`$PKG_CONFIG --variable=sysusersdir systemd 2>/dev/null`" && test -n "$def_systemdsysusersdir" || \
			 def_systemdsysusersdir="`$PKG_CONFIG --variable=sysusersdir libsystemd 2>/dev/null`" || def_systemdsysusersdir=""],
			[def_systemdsysusersdir=""])

		AS_IF([test x"${def_systemdsysusersdir}" = x], [
			AS_IF([test "${systemdsysusersdir}" = yes],
				[AC_MSG_ERROR([--with-systemdsysusersdir=${systemdsysusersdir} was requested, but PKG_CONFIG could not be queried for the system settings])])
			systemdsysusersdir=""
			], [systemdsysusersdir="${def_systemdsysusersdir}"])

		unset def_systemdsysusersdir
		;;
	no)
		systemdsysusersdir=""
		;;
	*)
		AS_IF([test -d "${systemdsysusersdir}"], [],
			[AC_MSG_WARN([--with-systemdsysusersdir='${systemdsysusersdir}' was requested, but that location does not currently exist in build environment - just so you know...])])
		;;
esac
if test "${systemdsysusersdir}" = "auto" ; then systemdsysusersdir=""; fi
if test -n "${systemdsysusersdir}"; then
	AC_MSG_RESULT(using ${systemdsysusersdir})
	NUT_REPORT_PATH_INTEGRATIONS([Systemd-sysusers configs], [${systemdsysusersdir}])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL([WITH_SYSTEMD_SYSUSERS], [test x"${systemdsysusersdir}" != "x"])
dnl What pathname would we embed into unit files ExecStartPre?
dnl TODO? Any need to make it a --with-... argument?
AC_PATH_PROG([SYSTEMD_SYSUSERS_PROGRAM], [systemd-sysusers], [/usr/bin/systemd-sysusers])


dnl Note: we may want binaries with sd_notify and similar features regardless
dnl of building and delivering unit files (which may be crafted separately).
dnl TODO: although end-user deployments (for custom builds) may be lacking
dnl libsystemd development files, they might have a `systemd-notify` program
dnl intended to help scripted service units. Consider making use of that then.
NUT_ARG_WITH([libsystemd], [build binaries with tighter systemd integration (notifications etc)], [auto])
NUT_CHECK_LIBSYSTEMD

AC_MSG_CHECKING(whether requested and can build binaries with tighter systemd integration support)
AS_IF([test x"${nut_with_libsystemd}" = xyes && test x"${nut_have_libsystemd}" != xyes],
	[AC_MSG_ERROR([--with-libsystemd was requested, but the library was not found or usable])])
AS_CASE(["${nut_with_libsystemd}"],
	[yes|no], [have_libsystemd="${nut_with_libsystemd}"],
	[AS_IF([test x"${nut_have_libsystemd}" = xyes],
		[with_libsystemd="yes"],
		[with_libsystemd="no"])
	])
AC_MSG_RESULT(${with_libsystemd})

AC_PATH_PROG([SYSTEMD_ANALYZE_PROGRAM], [systemd-analyze], [/usr/bin/systemd-analyze])

dnl Relevant since 2018 (v243): https://github.com/systemd/systemd/pull/12933
SYSTEMD_SUPPORTS_EXEC_CONDITION=no
AS_IF([test -x "$SYSTEMD_ANALYZE_PROGRAM"], [
	AC_MSG_CHECKING([if your systemd version supports ExecCondition])
	myFILE="`${MKTEMP} systemd-analyze-XXXXXX.service`"
	cat > "$myFILE" << EOF
@<:@Unit@:>@
Description=temp
@<:@Service@:>@
ExecCondition=/bin/true
ExecStart=/bin/true
Type=simple
EOF
	if myOUT="`\"$SYSTEMD_ANALYZE_PROGRAM\" verify \"$myFILE\" 2>&1`" ; then
		if (echo "$myOUT" | ${GREP} "Failed to parse service type, ignoring") ; then
			true
		else
			SYSTEMD_SUPPORTS_EXEC_CONDITION=yes
		fi
	fi
	rm -f "$myFILE"
	AC_MSG_RESULT([${SYSTEMD_SUPPORTS_EXEC_CONDITION}])
	])
AS_IF([test x"${SYSTEMD_SUPPORTS_EXEC_CONDITION}" = xyes], [
	dnl No comment
	SYSTEMD_AVAILABLE_EXEC_CONDITION=""
], [
	SYSTEMD_AVAILABLE_EXEC_CONDITION="### Since systemd v243 ### "
])

dnl Relevant since 2023: https://github.com/systemd/systemd/pull/25916
SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY=no
AS_IF([test -x "$SYSTEMD_ANALYZE_PROGRAM"], [
	AC_MSG_CHECKING([if your systemd version supports Type=notify])
	myFILE="`${MKTEMP} systemd-analyze-XXXXXX.service`"
	cat > "$myFILE" << EOF
@<:@Unit@:>@
Description=temp
@<:@Service@:>@
ExecStart=/bin/true
Type=notify
EOF
	if myOUT="`\"$SYSTEMD_ANALYZE_PROGRAM\" verify \"$myFILE\" 2>&1`" ; then
		if (echo "$myOUT" | ${GREP} "Failed to parse service type, ignoring") ; then
			true
		else
			SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY=yes
		fi
	fi
	rm -f "$myFILE"
	AC_MSG_RESULT([${SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY}])
	])

SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY_RELOAD=no
AS_IF([test -x "$SYSTEMD_ANALYZE_PROGRAM"], [
	AC_MSG_CHECKING([if your systemd version supports Type=notify-reload])
	myFILE="`${MKTEMP} systemd-analyze-XXXXXX.service`"
	cat > "$myFILE" << EOF
@<:@Unit@:>@
Description=temp
@<:@Service@:>@
ExecStart=/bin/true
Type=notify-reload
EOF
	if myOUT="`\"$SYSTEMD_ANALYZE_PROGRAM\" verify \"$myFILE\" 2>&1`" ; then
		if (echo "$myOUT" | ${GREP} "Failed to parse service type, ignoring") ; then
			true
		else
			SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY_RELOAD=yes
		fi
	fi
	rm -f "$myFILE"
	AC_MSG_RESULT([${SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY_RELOAD}])
	])

AS_IF([test x"${with_libsystemd}" = xyes && test x"${SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY}" = xyes], [
	dnl Built with sd_notify support
	dnl Note: `upsd -FF` both runs without forking and leaves a PID file, as
	dnl needed for `upsd -c reload` in legacy scripts and old habits to work:
	SYSTEMD_DAEMON_ARGS_UPSD="-FF"
	SYSTEMD_DAEMON_TYPE_UPSD="notify"
	SYSTEMD_DAEMON_ARGS_UPSLOG="-F"
	SYSTEMD_DAEMON_TYPE_UPSLOG="notify"
	SYSTEMD_DAEMON_ARGS_UPSMON="-F"
	SYSTEMD_DAEMON_TYPE_UPSMON="notify"
	SYSTEMD_DAEMON_ARGS_DRIVER="-FF"
	SYSTEMD_DAEMON_TYPE_DRIVER="notify"
	AS_IF([test x"${SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY_RELOAD}" = xyes], [
		dnl Macro supported since aclocal-1.11:
		m4_ifdef([AM_COND_IF],
		[AM_COND_IF([HAVE_CLOCK_GETTIME], [AM_COND_IF([HAVE_CLOCK_MONOTONIC], [SYSTEMD_DAEMON_TYPE_DRIVER="notify-reload"])])],
		[AS_IF([test x"${ac_cv_func_clock_gettime}" = "xyes"], [SYSTEMD_DAEMON_TYPE_DRIVER="notify-reload"])])
		])
	dnl Calling shell, upsdrvctl, driver, and then it forks... ugh!
	dnl https://github.com/systemd/systemd/issues/25961
	dnl FIXME: if NotifyAccess=cgroup appears, use it (consult SYSTEMD_VERSION)
	SYSTEMD_DAEMON_NOTIFYACCESS_DRIVER="NotifyAccess=all"
	dnl Similar for UPSMON with its two processes:
	SYSTEMD_DAEMON_NOTIFYACCESS_UPSMON="NotifyAccess=all"
	dnl UPSD is started directly by systemd and does not fork:
	SYSTEMD_DAEMON_NOTIFYACCESS_UPSD="NotifyAccess=main"
	dnl Similarly for upslog (per settings above):
	SYSTEMD_DAEMON_NOTIFYACCESS_UPSLOG="NotifyAccess=main"
	dnl Note: at this time we do not pre-define watchdog settings,
	dnl to avoid breaking something by a poorly hardcoded guess.
	dnl This is something end-users should do for their deployment,
	dnl especially for drivers
	SYSTEMD_DAEMON_WATCHDOG_DRIVER="#WatchdogSec=240s"
	SYSTEMD_DAEMON_WATCHDOG_UPSD="#WatchdogSec=240s"
	SYSTEMD_DAEMON_WATCHDOG_UPSLOG="#WatchdogSec=240s"
	SYSTEMD_DAEMON_WATCHDOG_UPSMON="#WatchdogSec=240s"
	SYSTEMD_DAEMON_TIMEOUT_STOP_UPSMON="#TimeoutStopSec=infinity"
	], [
	dnl "Usual" daemons that happen to be spawned by systemd
	SYSTEMD_DAEMON_ARGS_UPSD="-F"
	SYSTEMD_DAEMON_TYPE_UPSD="simple"
	SYSTEMD_DAEMON_ARGS_UPSLOG="-F"
	SYSTEMD_DAEMON_TYPE_UPSLOG="simple"
	SYSTEMD_DAEMON_ARGS_UPSMON="-F"
	SYSTEMD_DAEMON_TYPE_UPSMON="simple"
	SYSTEMD_DAEMON_ARGS_DRIVER=""
	SYSTEMD_DAEMON_TYPE_DRIVER="forking"
	SYSTEMD_DAEMON_NOTIFYACCESS_DRIVER=""
	SYSTEMD_DAEMON_NOTIFYACCESS_UPSD=""
	SYSTEMD_DAEMON_NOTIFYACCESS_UPSLOG=""
	SYSTEMD_DAEMON_NOTIFYACCESS_UPSMON=""
	dnl Watchdog should not be configured for not-notifying units, right?
	SYSTEMD_DAEMON_WATCHDOG_DRIVER="#WatchdogSec=240s"
	SYSTEMD_DAEMON_WATCHDOG_UPSD="#WatchdogSec=240s"
	SYSTEMD_DAEMON_WATCHDOG_UPSLOG="#WatchdogSec=240s"
	SYSTEMD_DAEMON_WATCHDOG_UPSMON="#WatchdogSec=240s"
	dnl With "SHUTDOWNEXIT" in play, stopping this unit MAY take time (or forever)
	SYSTEMD_DAEMON_TIMEOUT_STOP_UPSMON="TimeoutStopSec=infinity"
	])

NUT_REPORT_FEATURE([build with tighter systemd support], [${with_libsystemd}], [],
	[WITH_LIBSYSTEMD], [Define to build with tighter systemd support (sd_notify etc)])

nut_with_libsystemd_inhibitor=0
AS_IF([test x"${with_libsystemd}" = xyes && test x"${nut_have_libsystemd_inhibitor}" = xyes], [nut_with_libsystemd_inhibitor=1])
AC_DEFINE_UNQUOTED(WITH_LIBSYSTEMD_INHIBITOR, [${nut_with_libsystemd_inhibitor}], [Define as 1 if we can use systemd inhibitor interface here])
AM_CONDITIONAL([WITH_LIBSYSTEMD_INHIBITOR], [test x"${nut_with_libsystemd_inhibitor}" = x1])

dnl ---------------------------------------------------------------------
dnl Tests for CppUnit availability and usability (will be built if we can,
dnl and if valgrind is enabled for this configuration - reported below).
dnl Using CppUnit implies C++ support!
dnl Theoretically, libcppunit-dev will pull up to g++, through libstdc++...
dnl AM_PATH_CPPUNIT(1.9.6)

dnl # Tests with gcc-4.8 require this C++11 option to be provided explicitly
dnl # gcc-4.6 does not support this yet; newer gcc's should be ok by default.
dnl # Could use `AX_CXX_COMPILE_STDCXX_11([noext], [optional])` if it were
dnl # available everywhere. Or AX_CHECK_COMPILE_FLAG if it was ubiquitous:
dnl ###AX_CHECK_COMPILE_FLAG([-std=c++11],
dnl ###    [CXXFLAGS="$CXXFLAGS -std=c++11"
dnl ###     have_cxx11=yes],
dnl ###    [have_cxx11=no])

AC_MSG_CHECKING(for C++11 support in current compiler)
have_cxx11=unknown
my_CXXFLAGS="$CXXFLAGS"
AC_LANG_PUSH([C++])

CPLUSPLUS_DECL='
#include <stdio.h>
#if __cplusplus < 201103L
  #error This library needs at least a C++11 compliant compiler
#endif

/* Make sure it supports modern syntax */
#include <string>
#include <map>
'
CPLUSPLUS_MAIN='
printf("%ld\n", __cplusplus);
/* Make sure it supports modern syntax */
std::map<std::string, std::string> map;
map.emplace("key", "value");
'

AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[${CPLUSPLUS_DECL}]], [[${CPLUSPLUS_MAIN}]])],
    [AC_MSG_RESULT([yes, out of the box])
     have_cxx11=yes],
    [AS_CASE(["${CXXFLAGS}"],
        [*"-std="*|*"-ansi"*], [
            AC_MSG_RESULT([no, not with the standard already set in CXXFLAGS='${CXXFLAGS}'])
            have_cxx11=no
        ],[
            CXXFLAGS="$CXXFLAGS -std=c++11"
            AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[${CPLUSPLUS_DECL}]], [[${CPLUSPLUS_MAIN}]])],
                [AC_MSG_RESULT([yes, GCC-style (as C++11)])
                 have_cxx11=yes],
                [CXXFLAGS="$CXXFLAGS -std=c++0x"
                 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[${CPLUSPLUS_DECL}]], [[${CPLUSPLUS_MAIN}]])],
                    [AC_MSG_RESULT([yes, GCC-style (as C++0X)])
                     have_cxx11=yes],
                    [AC_MSG_RESULT([no])
                     CXXFLAGS="$my_CXXFLAGS"
                     have_cxx11=no])])])])
NUT_REPORT_FEATURE([build C++11 codebase (client library, etc.)], [${have_cxx11}], [],
					[HAVE_CXX11], [Define to enable C++11 support])
AC_LANG_POP([C++])
unset CPLUSPLUS_MAIN
unset CPLUSPLUS_DECL

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING(for have_cppunit)
have_cppunit="no"
dnl CPPUNIT_NUT_CXXFLAGS are set below if suitable, but can be
dnl disabled further below if nut_with_debuginfo gets applied
dnl for all NUT build products:
CPPUNIT_NUT_CXXFLAGS=""
AS_IF([test x"$have_PKG_CONFIG" = xyes],
    [AS_IF([test x"${have_cxx11}" = xyes],
        [ifdef([PKG_CHECK_MODULES], [PKG_CHECK_MODULES(CPPUNIT, cppunit, have_cppunit=yes, have_cppunit=no)], [have_cppunit=no])
         AS_IF([test "${have_cppunit}" != "yes"],
            [AC_MSG_WARN([libcppunit not found - those C++ tests will not be built.])
             have_cppunit=no],
            [AS_IF([test "x$GXX" = xyes],
             [CPPUNIT_NUT_CXXFLAGS="-g -O0"])
            ])
        ])
    ], [AC_MSG_WARN([pkg-config not found, can not look properly for libcppunit - those C++ tests will not be built.])
        have_cppunit=no]
)
AC_MSG_RESULT(${have_cppunit})

dnl On some systems, CppUnit inexplicably fails with trivial assertions
dnl so it should not be enabled with those environments, corrupting the
dnl test results with misleading errors.
dnl Tracked in https://github.com/networkupstools/nut/issues/1126
dnl One such situation was e.g. "clang++ + arm64(QEMU) + -m64" while
dnl this was not seen with other compilers or bitness on same system.
AS_IF([test "${have_cppunit}" = "yes"],
    [AC_MSG_CHECKING([if current toolkit can build and run cppunit tests (e.g. no ABI issues, related segfaults, etc.)])
     dnl Code below is largely a stripped variant of our tests/example.cpp and cpputest.cpp
     CPLUSPLUS_DECL='
#include <stdexcept>
#include <cppunit/extensions/HelperMacros.h>
#include <cppunit/CompilerOutputter.h>
#include <cppunit/extensions/TestFactoryRegistry.h>
#include <cppunit/ui/text/TestRunner.h>

class ExampleTest : public CppUnit::TestFixture
{
  CPPUNIT_TEST_SUITE( ExampleTest );
    CPPUNIT_TEST( testOne );
  CPPUNIT_TEST_SUITE_END();
public:
  void setUp() {};
  void tearDown() {};
  void testOne();
};
CPPUNIT_TEST_SUITE_REGISTRATION( ExampleTest );
void ExampleTest::testOne()
{
  int i = 1;
  float f = 1.0;
  int cast = static_cast<int>(f);
  CPPUNIT_ASSERT_EQUAL_MESSAGE("Casted float is not the expected int (assert_eq)", i, cast );
  CPPUNIT_ASSERT_MESSAGE("Casted float is not the expected int (assert)", (i == cast) );
}
'

     CPLUSPLUS_MAIN='
CppUnit::Test *suite = CppUnit::TestFactoryRegistry::getRegistry().makeTest();
CppUnit::TextUi::TestRunner runner;
runner.addTest( suite );
runner.setOutputter( new CppUnit::CompilerOutputter( &runner.result(), std::cerr ) );
bool res = runner.run();
return res ? 0 : 1;
'

     my_CXXFLAGS="$CXXFLAGS"
     my_LDFLAGS="$LDFLAGS"
     my_LIBS="$LIBS"
     CXXFLAGS="$myCXXFLAGS $pkg_cv_CPPUNIT_CFLAGS $pkg_cv_CPPUNIT_CXXFLAGS"
     LDFLAGS="$my_LDFLAGS $pkg_cv_CPPUNIT_LDFLAGS"
     LIBS="$my_LIBS $pkg_cv_CPPUNIT_LIBS"
     AC_LANG_PUSH([C++])
     AX_RUN_OR_LINK_IFELSE([AC_LANG_PROGRAM([[${CPLUSPLUS_DECL}]], [[${CPLUSPLUS_MAIN}]])],
        [have_cppunit=yes], [have_cppunit=no])
     CXXFLAGS="$my_CXXFLAGS"
     LDFLAGS="$my_LDFLAGS"
     LIBS="$my_LIBS"
     AC_LANG_POP([C++])
     unset CPLUSPLUS_MAIN
     unset CPLUSPLUS_DECL
     AC_MSG_RESULT(${have_cppunit})
     ])

dnl # By default keep the originally detected have_cppunit value
AC_MSG_CHECKING(for impact from --enable-cppunit option - should we build cppunit tests?)
NUT_ARG_ENABLE([cppunit], [(yes|no|force|auto)], [Enable CPPUNIT tests for C++ bindings], [auto])
AS_CASE(["${nut_enable_cppunit}"],
	["force"], [AS_IF([test x"${have_cppunit}" = xyes], [], [
		AC_MSG_WARN([--enable-cppunit=yes can not be satisfied, but developer asked for it])
		have_cppunit=yes
		])],
	["yes"], [AS_IF([test x"${have_cppunit}" = xyes], [], [AC_MSG_ERROR([--enable-cppunit=yes can not be satisfied])])],
	["no"], [have_cppunit=no]
		dnl # "auto" and other values keep what was detected (or not)
)
AC_MSG_RESULT(${have_cppunit})

NUT_REPORT_FEATURE([build C++ tests with CPPUNIT], [${have_cppunit}], [],
					[HAVE_CPPUNIT], [Define to enable CPPUNIT tests])

dnl ----------------------------------------------------------------------
dnl Practical C++ code:

AC_MSG_CHECKING(whether we can and want to build nutconf configuration-management tool)

AS_CASE(["${nut_with_nutconf}"],
		["auto"], [AS_IF([test x"${have_cxx11}" = xyes], [nut_with_nutconf="yes"], [nut_with_nutconf="no"])],
		["yes"], [AS_IF([test x"${have_cxx11}" = xyes], [], [AC_MSG_ERROR([explicit --with-nutconf=yes can not be satisfied: C++11 support not enabled])])],
		["no"], [nut_with_nutconf=no]
	)
AC_MSG_RESULT(${nut_with_nutconf})

AM_CONDITIONAL(WITH_NUTCONF, test "${nut_with_nutconf}" = "yes")
NUT_REPORT_PROGRAM([build and install the nutconf tool (experimental, may lack support for recent NUT options)],
					[${nut_with_nutconf}], [],
					[WITH_NUTCONF], [Define to enable nutconf tool support])

dnl ----------------------------------------------------------------------

dnl Depends on C++, potentially nutconf and dev...
dnl If not enabled for delivery, the library is built as internal detail
dnl of the tool (if that is enabled)
AC_MSG_CHECKING([whether we can and want to deliver the libnutconf library and headers])

AS_CASE(["${nut_with_dev_libnutconf}"],
		["auto"], [AS_IF([test x"${have_cxx11}" = xyes], [nut_with_dev_libnutconf="yes"], [nut_with_dev_libnutconf="no"])],
		["yes"], [AS_IF([test x"${have_cxx11}" = xyes], [], [AC_MSG_ERROR([explicit --with-dev-libnutconf=yes can not be satisfied: C++11 support not enabled])])],
		["no"], [nut_with_dev_libnutconf=no]
	)
AC_MSG_RESULT(${nut_with_dev_libnutconf})

AM_CONDITIONAL(WITH_DEV_LIBNUTCONF, test "${nut_with_dev_libnutconf}" = "yes")
NUT_REPORT_PROGRAM([build and install the deliver the libnutconf library and headers (experimental)],
					[${nut_with_dev_libnutconf}], [],
					[WITH_DEV_LIBNUTCONF], [Define to enable delivery of libnutconf developer files])

AS_IF([test x"$nut_with_dev_libnutconf" = x"yes" -a x"${nut_with_dev}" != x"yes"], [
	AC_MSG_WARN([You are effectively building --with-dev-libnutconf --without-dev, so would only get this library and headers but maybe not others it might need])
])
AS_IF([test x"$nut_with_dev_libnutconf" = x"yes" -a x"${nut_with_nutconf}" != x"yes"], [
	AC_MSG_NOTICE([You are effectively building --with-dev-libnutconf --without-nutconf, so would only get the library and headers but not the tool])
])
AS_IF([test x"$nut_with_dev_libnutconf" != x"yes" -a x"${nut_with_nutconf}" = x"yes"], [
	AC_MSG_NOTICE([You are effectively building --without-dev-libnutconf --with-nutconf, so would only get the tool (library and headers are just its internal detail during build)])
])

dnl At least the lib and/or the tool delivery are enabled, generate the
dnl automake rules to build the library (privately or publicly, that depends):
AM_CONDITIONAL(WITH_LIBNUTCONF, [test x"${nut_with_dev_libnutconf}" = x"yes" -o x"${nut_with_nutconf}" = x"yes"])

dnl ----------------------------------------------------------------------
dnl Other third-party integrations

AC_MSG_CHECKING(whether to install Augeas configuration-management lenses)
NUT_ARG_WITH([augeas-lenses-dir], [(DIRPATH|yes|no|auto)], [Whether/where to install Augeas configuration-management lenses, typically /usr/share/augeas/lenses{/dist,/}], [auto])

AS_CASE([${nut_with_augeas_lenses_dir}],
	[yes],	[if test -z "${auglensdir}"; then
			AC_MSG_RESULT(no)
			AC_MSG_ERROR([augeas lenses directory requested but not found in default location])
		 fi
		 if test ! -s scripts/augeas/nutupsconf.aug.in ; then
			AC_MSG_RESULT(no)
			AC_MSG_ERROR([augeas lenses directory requested but a non-trivial scripts/augeas/nutupsconf.aug.in was not provided by autogen.sh or dist archive])
		 fi
		],
	[auto],	[if test ! -s scripts/augeas/nutupsconf.aug.in ; then
			AC_MSG_WARN([augeas lenses directory skipped because a non-trivial scripts/augeas/nutupsconf.aug.in was not provided by autogen.sh or dist archive])
			auglensdir=""
		 fi
		],
	[no],	[auglensdir=""],
		[auglensdir="${nut_with_augeas_lenses_dir}"]
)
if test -n "${auglensdir}"; then
	AC_MSG_RESULT(using ${auglensdir})
	NUT_REPORT_PATH_INTEGRATIONS([Augeas lenses directory], [${auglensdir}])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL(WITH_AUGLENS, test -n "${auglensdir}")

if test -n "${auglensdir}"; then
	auglenstestsdir="${auglensdir}/tests"
else
	auglenstestsdir=''
fi

AC_PATH_PROGS([AUGPARSE], [augparse], [none])
AM_CONDITIONAL([HAVE_AUGPARSE], [test "x${AUGPARSE}" != "xnone"])
AC_MSG_CHECKING([whether to enable Augeas configuration-management lenses tests])
if test "x${AUGPARSE}" != xnone ; then
	AC_MSG_RESULT(yes)
else
	AC_MSG_RESULT(no)
fi

dnl ----------------------------------------------------------------------

dnl Note: initial hotplugdir value, empty or not, was determined far above
AC_MSG_CHECKING(whether to install hotplug rules)
NUT_ARG_WITH([hotplug-dir], [(DIRPATH|yes|no|auto)], [Whether/where to install hotplug rules, typically /etc/hotplug], [auto])

AS_CASE([${nut_with_hotplug_dir}],
	[yes],
		[if test -z "${hotplugdir}"; then
			AC_MSG_RESULT(no)
			AC_MSG_ERROR([hotplug directory requested but not found])
		 fi],
	[auto],	[],
	[no],	[hotplugdir=""],
		[hotplugdir="${nut_with_hotplug_dir}"]
)
if test -n "${hotplugdir}"; then
	AC_MSG_RESULT(using ${hotplugdir})
	NUT_REPORT_PATH_INTEGRATIONS([Hotplug rules directory], [${hotplugdir}])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL(WITH_HOTPLUG, test -n "${hotplugdir}")

dnl Note: initial udevdir value, empty or not, was determined far above
AC_MSG_CHECKING(whether to install udev rules)
NUT_ARG_WITH([udev-dir], [(DIRPATH|yes|no|auto)], [Whether/where to install udev rules, typically /lib/udev or /etc/udev], [auto])

AS_CASE([${nut_with_udev_dir}],
	[yes],	dnl Typically /lib/udev or /etc/udev
		[if test -z "${udevdir}"; then
			AC_MSG_RESULT(no)
			AC_MSG_ERROR([udev directory requested but not found])
		 fi
		 if test "${nut_with_usb}" = yes && test ! -s scripts/udev/nut-usbups.rules.in ; then
			AC_MSG_RESULT(no)
			AC_MSG_ERROR([udev directory and USB driver support requested but a non-trivial scripts/udev/nut-usbups.rules.in was not provided by autogen.sh or dist archive])
		 fi
		],
	[auto],
		[if test "${nut_with_usb}" = yes && test ! -s scripts/udev/nut-usbups.rules.in ; then
			AC_MSG_WARN([udev directory skipped because a non-trivial scripts/udev/nut-usbups.rules.in was not provided by autogen.sh or dist archive])
			udevdir=""
		 fi
		],
	[no],	[udevdir=""],
		[udevdir="${nut_with_udev_dir}"]
)
if test -n "${udevdir}"; then
	AC_MSG_RESULT(using ${udevdir})
	NUT_REPORT_PATH_INTEGRATIONS([Udev rules directory], [${udevdir}])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL(WITH_UDEV, test -n "${udevdir}")


dnl FreeBSD devd support
dnl Note: initial udevdir value, empty or not, was determined far above
AC_MSG_CHECKING(whether to install FreeBSD devd nut-usb.conf file)
NUT_ARG_WITH([devd-dir], [(DIRPATH|yes|no|auto)], [Whether/where to install devd snippet nut-usb.conf file, typically /usr/local/etc/devd or /etc/devd], [auto])

AS_CASE([${nut_with_devd_dir}],
	[yes],	dnl Typically /usr/local/etc/devd or /etc/devd
		[if test -z "${devddir}"; then
			AC_MSG_RESULT(no)
			AC_MSG_ERROR([devd directory requested but not found])
		 fi
		 if test "${nut_with_usb}" = yes && test ! -s scripts/devd/nut-usb.conf.in ; then
			AC_MSG_RESULT(no)
			AC_MSG_ERROR([devd directory and USB driver support requested but non-trivial scripts/devd/nut-usb.conf.in was not provided by autogen.sh or dist archive])
		 fi
		],
	[auto],
		[if test "${nut_with_usb}" = yes && test ! -s scripts/devd/nut-usb.conf.in ; then
			AC_MSG_WARN([devd directory skipped because non-trivial scripts/devd/nut-usb.conf.in was not provided by autogen.sh or dist archive])
			devddir=""
		 fi
		],
	[no],	[devddir=""],
		[devddir="${nut_with_devd_dir}"]
)
if test -n "${devddir}"; then
	AC_MSG_RESULT(using ${devddir})
	NUT_REPORT_PATH_INTEGRATIONS([FreeBSD devd rules directory], [${devddir}])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL(WITH_DEVD, test -n "${devddir}")


dnl FreeBSD quirks support:
freebsdquirksdir=""
AC_MSG_CHECKING(whether to install FreeBSD site-local USB quirks file)
NUT_ARG_WITH([freebsd-quirks-dir], [(DIRPATH|yes|no|auto)], [Whether/where to install nut-usb.quirks file, typically ${datadir}], [auto])

AS_CASE([${nut_with_freebsd_quirks_dir}],
	[yes],	dnl Typically /usr/local/share/nut
		[freebsdquirksdir="${datadir}"],
	[auto],	dnl Are we building for FreeBSD with such customizations?
		[if test -s /boot/loader.conf.local ; then
			freebsdquirksdir="${datadir}"
		 fi
		 if test "${nut_with_usb}" = yes && test ! -s scripts/devd/nut-usb.quirks ; then
			AC_MSG_WARN([freebsd-quirks-dir directory skipped because a non-trivial scripts/devd/nut-usb.quirks was not provided by autogen.sh or dist archive])
			freebsdquirksdir=""
		 fi
		],
	[no],	[freebsdquirksdir=""],
		[freebsdquirksdir="${nut_with_freebsd_quirks_dir}"]
)
if test -n "${freebsdquirksdir}"; then
	AC_MSG_RESULT(using ${freebsdquirksdir})
	NUT_REPORT_PATH_INTEGRATIONS([FreeBSD site-local USB quirks directory (add into /boot/loader.conf.local)], [${freebsdquirksdir}])
else
	AC_MSG_RESULT(no)
fi

if test -n "${freebsdquirksdir}" ; then
	dnl Expand datadir or similar macros in this path
	conftemp="${freebsdquirksdir}"
	eval conftemp=\"${conftemp}\"
	eval conftemp=\"${conftemp}\"
	freebsdquirksdir="${conftemp}"

	if test -z "${freebsdquirksdir}"; then
		AC_MSG_ERROR([freebsd-quirks-dir requested but not found (resolved as empty)])
	fi

	if test "${nut_with_usb}" = yes && test ! -s scripts/devd/nut-usb.quirks ; then
		AC_MSG_ERROR([freebsd-quirks-dir directory and USB driver support requested, but a non-trivial scripts/devd/nut-usb.quirks was not provided by autogen.sh or dist archive])
	fi
fi

AM_CONDITIONAL(WITH_FREEBSD_QUIRKS_DIR, test -n "${freebsdquirksdir}")

dnl ---------------------------------------------------------------------
dnl Can use valgrind for memory-leak testing, if present
AC_PATH_PROGS([VALGRIND], [valgrind], [none])
dnl Caller can provide a specific valgrind implementation to use:
dnl FIXME: Set default to "auto" after ensuring that we pass on all NUT CI farm platforms
NUT_ARG_WITH([valgrind], [(yes|no|auto|/path/to/valgrind)], [whether to use valgrind for memory-leak testing], [no])

dnl ### echo "Caller said: '${nut_with_valgrind}'... Initially discovered tool: '${VALGRIND}'... "
AS_CASE([${nut_with_valgrind}],
	[yes],	[if test "x$VALGRIND" = "xnone"; then
			AC_MSG_RESULT(no)
			AC_MSG_ERROR([valgrind requested but not found])
		 fi
		 with_valgrind="yes"
		],
	[auto],	[with_valgrind="auto"],
	[no],	[with_valgrind="no"],
		[AC_PATH_PROGS([VALGRIND], ["${nut_with_valgrind}"], [none])
		 if test "x$VALGRIND" = "xnone"; then
			AC_MSG_RESULT(no)
			AC_MSG_ERROR([valgrind requested but not found])
		 fi
		 with_valgrind="yes"
		]
)

dnl Even if the tool is installed, it may be not usable on build platform.
dnl QEMU may further complicate things, providing CPUs that formally match
dnl a supported family but crash in practice, or hopefully rejected early:
dnl valgrind: fatal error: unsupported CPU.
dnl    Supported CPUs are:
dnl    * x86 (practically any; Pentium-I or above), AMD Athlon or above)
dnl    * AMD Athlon64/Opteron
dnl    * ARM (armv7)
dnl    * MIPS (mips32 and above; mips64 and above)
dnl    * PowerPC (most; ppc405 and above)
dnl    * System z (64bit only - s390x; z990 and above)
dnl Even if the tool does basically start, on some QEMU systems it crashes
dnl later (e.g. claims Signal 11 in tear-down after a successful test), so
dnl we support an explicit --without-valgrind (aka --with-valgrind=no) too.
dnl In some versions of OpenIndiana it was also seen to fail with SIGILL
dnl when running `valgrind /bin/sh <whatever>` and even `valgrind /bin/true`
dnl but succeeded for other programs; and those failures left a log of core
dnl dump files on the CI build agent:
dnl    vex x86->IR: unhandled instruction bytes: 0x2E 0x8D 0x74 0x26
dnl    ==360612== valgrind: Unrecognised instruction at address 0x3ffe291b.
dnl    ==360612==    at 0x3FFE291B: strchr (in /lib/ld.so.1)
dnl    ==360612==    by 0x3FFCEB5B: procenv_user (in /lib/ld.so.1)
dnl    ==360612==    by 0x3FFCB34A: setup (in /lib/ld.so.1)
dnl    ==360612==    by 0x3FFDBC49: _setup (in /lib/ld.so.1)
dnl    ==360612==    by 0x3FFC0D94: _rt_boot (in /lib/ld.so.1)
dnl    ==360612==    by 0x37FEFE46: ???
AS_IF([test -n "${VALGRIND}" && test x"${VALGRIND}" != xnone && test "x${with_valgrind}" != xno], [
	AC_MSG_CHECKING([whether valgrind is usable on current platform])
	AS_IF([( ${VALGRIND} --help >/dev/null 2>/dev/null )], [
		TESTCMD="/bin/sh -c true"
		echo 'int main(void) { return 0; }' > test-true.c && \
		${CC} ${CFLAGS} test-true.c -o test-true && \
		./test-true && \
		TESTCMD="./test-true"
		AS_IF([( ${VALGRIND} $TESTCMD >/dev/null 2>/dev/null )],
			[AC_MSG_RESULT([yes])],
			[AC_MSG_RESULT([no])
			 VALGRIND="none"
			])
		rm -f ./test-true ./test-true.c
		unset TESTCMD
		],
		[AC_MSG_RESULT([no])
		 VALGRIND="none"
		])

	AS_IF([test "x$VALGRIND" = "xnone" && test "x${with_valgrind}" = "xyes"], [
		AC_MSG_ERROR([valgrind requested but '${VALGRIND}' is not usable])
	])
])

if test "x${with_valgrind}" = "xauto"; then
	if test "x$VALGRIND" = "xnone"; then
		with_valgrind="no"
	else
		with_valgrind="yes"
	fi
fi

AC_MSG_CHECKING(whether to use valgrind for memory-leak testing)
if test "x${with_valgrind}" = "xyes"; then
	AC_MSG_RESULT(using ${VALGRIND})
	AC_MSG_NOTICE([Do not forget to build with debug (e.g. pass '-g' in CFLAGS for GCC) for best results with valgrind tests])
else
	AC_MSG_RESULT(no)
fi
AM_CONDITIONAL([HAVE_VALGRIND], [test "x${VALGRIND}" != "xnone"])
AM_CONDITIONAL([WITH_VALGRIND], [test "x${with_valgrind}" = "xyes"])

AC_MSG_CHECKING([whether to build cppunit tests using valgrind support])
if test "x${with_valgrind}" = xyes && test "x${have_cppunit}" = xyes ; then
	AC_MSG_RESULT(yes)
else
	AC_MSG_RESULT(no)
fi

dnl For ages we expanded ${sysconfdir} and wrote it out - note that most
dnl packages overrode it to be /etc/nut, /etc/ups or similar, while the
dnl pure autotools default would be $prefix/etc (and a separate setting
dnl or hard-coded value added on top of that).
dnl Since NUT v2.8.5 we encourage using either a dedicated customization
dnl --with-confdir-suffix (value like '/nut' or empty depends on situation),
dnl or a complete --with-confdir='${sysconfdir}${nut_with_confdir_suffix}'
dnl (for common use-cases matched with legacy usage, there should be no
dnl change: would use sysconfdir (if set) with empty nut_with_confdir_suffix.
conftemp="${nut_with_confdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
CONFPATH="${conftemp}"
NUT_REPORT_SETTING_PATH([Config file path],
    CONFPATH, "${conftemp}", [Default path for configuration files])

dnl Some distros prefer these not in system CONFPATH but in docs or similar
conftemp="${nut_with_confdir_examples}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
CONFPATH_EXAMPLES="${conftemp}"
NUT_REPORT_SETTING_PATH([Config file examples path],
    CONFPATH_EXAMPLES, "${conftemp}", [Default path for example configuration files])

dnl same for datadir
conftemp="${datadir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
NUT_DATADIR="${conftemp}"
NUT_REPORT_SETTING_PATH([Data file path],
    NUT_DATADIR, "${conftemp}", [Default path for data files])

dnl same for mandir
conftemp="${mandir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
NUT_MANDIR="${conftemp}"
NUT_REPORT_SETTING_PATH([Man page path],
    NUT_MANDIR, "${conftemp}", [Default path for man page files])

dnl same for bindir
conftemp="${bindir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
BINDIR="${conftemp}"
NUT_REPORT_SETTING_PATH([Tool program path],
    BINDIR, "${conftemp}", [Default path for user executables])

dnl same for sbindir
conftemp="${sbindir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
SBINDIR="${conftemp}"
NUT_REPORT_SETTING_PATH([System program path],
    SBINDIR, "${conftemp}", [Default path for system executables])

dnl same for libdir
conftemp="${libdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
LIBDIR="${conftemp}"
NUT_REPORT_SETTING_PATH([System library path],
    LIBDIR, "${conftemp}", [Default path for system libraries])

dnl same for libexecdir
conftemp="${libexecdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
LIBEXECDIR="${conftemp}"
NUT_REPORT_SETTING_PATH([System exec-library path],
    LIBEXECDIR, "${conftemp}", [Default path for system exec-libraries])

dnl ----------------------------------------------------------------------
dnl Check if NUT recipe metadata should propagate an uncommon RPATH

AC_MSG_CHECKING([whether NUT libdir='${LIBDIR}' is among common search paths])
DEFAULT_SEARCH_DIRS="`LANG=C LC_ALL=C ${CC} --print-search-dirs 2>/dev/null | ${GREP} libraries: | sed 's,^@<:@^=@:>@*=,,'`" 2>/dev/null || DEFAULT_SEARCH_DIRS=""
NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS=""
NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS_TEXT=""
if test x"${DEFAULT_SEARCH_DIRS}" = x ; then
	NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS="got empty list"
	NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS_TEXT="could not detect default library search paths"
else
	AS_CASE(["${target_os}"],
		[*mingw*], [ dnl # At least tooling on MSYS2 semi-native builds can return
			dnl # semicolon-separated paths with possibly "C:/mingw..." spelling
			DEFAULT_SEARCH_DIRS="`echo \":$DEFAULT_SEARCH_DIRS\" | sed 's,\(@<:@:;@:>@\)\(@<:@A-Z@:>@\):/,:/\2/,g' | tr ':' '\n' | sed 's,/*$,,'`"
			],
			[DEFAULT_SEARCH_DIRS="`echo \"$DEFAULT_SEARCH_DIRS\" | tr ':' '\n' | sed 's,/*$,,'`"]
	)

	NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS="no"
	NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS_TEXT="NUT libdir is not among common search paths"
	dnl # FIXME: ARCH subdirs on some platforms

	dnl # If NUT libdir does not exist, it is not systemic right away
	if test -d "${LIBDIR}" ; then
		LIBDIR_REALPATH="`cd \"${LIBDIR}\" && pwd`" || LIBDIR_REALPATH="${LIBDIR}"
		LIBDIR_REALPATH="`echo \"${LIBDIR_REALPATH}\" | sed 's,/*$,,'`"
		for D in ${DEFAULT_SEARCH_DIRS} ; do
			if test x"$D" = x"${LIBDIR_REALPATH}" ; then
				NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS="yes"
				NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS_TEXT="NUT libdir is among common search paths"
				break
			else
				D_REALPATH="`cd \"${D}\" 2>/dev/null && pwd`" && \
				if test x"${D_REALPATH}" = x"${LIBDIR_REALPATH}" ; then
					NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS="yes"
					NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS_TEXT="NUT libdir is among common search paths"
					break
				fi
			fi
		done
	fi
fi
AC_MSG_RESULT([${NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS}])
AS_IF([test x"${nut_enable_configure_debug}" = xyes && test x"${DEFAULT_SEARCH_DIRS}" != x], [
	AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) Checked paths: ${DEFAULT_SEARCH_DIRS}])
])

dnl Check if we want to expose non-standard RPATH to third-party consumers
dnl of libupsclient etc. Keep verbatim dollar-var here, expand in pkg-config!
dnl NOTE: hardcode_libdir_flag_spec(_CXX) vars come from LT INIT above
dnl For "auto", we check for non-std path and set "no" if prefix/libdir *is* common
LDFLAGS_NUT_RPATH=''
LDFLAGS_NUT_RPATH_CXX=''
AC_MSG_CHECKING([whether to suggest a LDFLAGS_NUT_RPATH in pkg-config et al, and which])
RPATH_CIRCUMSTANCE=''
case "${nut_enable_ldflags_nut_rpath}" in
	no) ;;
	auto|yes|"")
		dnl FIXME: perhaps prefer the new-ELF tricks for "runpath"
		dnl  (so LD_LIBRARY_PATH can override the built-in suggestion)
		if test "${nut_enable_ldflags_nut_rpath}" = auto ; then
			RPATH_CIRCUMSTANCE="${NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS_TEXT}"
			case "${NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS}" in
				"got empty list"|no)	;; dnl # keep "auto"
				yes)	nut_enable_ldflags_nut_rpath=no ;;
			esac
		fi
		if test "${nut_enable_ldflags_nut_rpath}" != no ; then
			if test x"${hardcode_libdir_flag_spec}" != x ; then
				LDFLAGS_NUT_RPATH="`libdir='${libdir}'; eval echo \"${hardcode_libdir_flag_spec}\"`"
			else
				RPATH_CIRCUMSTANCE="autotools did not report a way to specify rpath for C"
				dnl # LDFLAGS_NUT_RPATH='-R${libdir} -Wl,-rpath,${libdir}'
			fi
		fi
		;;
	*) LDFLAGS_NUT_RPATH="${nut_enable_ldflags_nut_rpath}" ;;
esac

AS_IF([test x"${LDFLAGS_NUT_RPATH}" = x],
	[AC_MSG_RESULT([none])
	 AS_IF([test x"${RPATH_CIRCUMSTANCE}" != x], [
	    AC_MSG_NOTICE([Reason: ${RPATH_CIRCUMSTANCE}])])
	],
	[AC_MSG_RESULT([yes: ${LDFLAGS_NUT_RPATH}])
	 AS_IF([test x"${RPATH_CIRCUMSTANCE}" != x], [
	    AC_MSG_NOTICE([Warning: ${RPATH_CIRCUMSTANCE}])])
	]
)

AC_MSG_CHECKING([whether to suggest a LDFLAGS_NUT_RPATH_CXX in pkg-config et al, and which])
RPATH_CIRCUMSTANCE=''
case "${nut_enable_ldflags_nut_rpath_cxx}" in
	no) ;;
	auto|yes|"")
		dnl FIXME: perhaps prefer the new-ELF tricks for "runpath"
		dnl  (so LD_LIBRARY_PATH can override the built-in suggestion)
		if test "${nut_enable_ldflags_nut_rpath_cxx}" = auto ; then
			RPATH_CIRCUMSTANCE="${NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS_TEXT}"
			case "${NUT_LIBDIR_IN_DEFAULT_SEARCH_DIRS}" in
				"got empty list"|no)	;; dnl # keep "auto"
				yes)	nut_enable_ldflags_nut_rpath_cxx=no ;;
			esac
		fi
		if test "${nut_enable_ldflags_nut_rpath_cxx}" != no ; then
			if test x"${hardcode_libdir_flag_spec_CXX}" != x ; then
				LDFLAGS_NUT_RPATH_CXX="`libdir='${libdir}'; eval echo \"${hardcode_libdir_flag_spec_CXX}\"`"
			else
				RPATH_CIRCUMSTANCE="autotools did not report a way to specify rpath for C++"
				dnl # LDFLAGS_NUT_RPATH_CXX='-R${libdir} -Wl,-rpath,${libdir}'
			fi
		fi
		;;
	*) LDFLAGS_NUT_RPATH_CXX="${nut_enable_ldflags_nut_rpath_cxx}" ;;
esac

AS_IF([test x"${LDFLAGS_NUT_RPATH_CXX}" = x],
	[AC_MSG_RESULT([none])
	 AS_IF([test x"${RPATH_CIRCUMSTANCE}" != x], [
	    AC_MSG_NOTICE([Reason: ${RPATH_CIRCUMSTANCE}])])
	],
	[AC_MSG_RESULT([yes: ${LDFLAGS_NUT_RPATH_CXX}])
	 AS_IF([test x"${RPATH_CIRCUMSTANCE}" != x], [
	    AC_MSG_NOTICE([Warning: ${RPATH_CIRCUMSTANCE}])])
	]
)

dnl ----------------------------------------------------------------------
dnl checks related to --with-snmp enabled on command-line

dnl ${nut_with_snmp}: any value except "yes" or "no" is treated as "auto".
if test "${nut_with_snmp}" = "yes" -a "${nut_have_libnetsnmp}" != "yes"; then
   AC_MSG_ERROR([Net-SNMP libraries not found, required for SNMP drivers])
fi

if test "${nut_with_snmp}" != "no"; then
   nut_with_snmp="${nut_have_libnetsnmp}"
else
   nut_have_libnetsnmp_static="no"
fi

NUT_REPORT_DRIVER([build SNMP drivers], [${nut_with_snmp}], [],
					[WITH_SNMP], [Define to enable SNMP support])
NUT_REPORT_DRIVER([build SNMP drivers with statically linked lib(net)snmp], [${nut_have_libnetsnmp_static}], [],
					[WITH_SNMP_STATIC], [Define to use SNMP support with a statically linked libnetsnmp])


if test -n "${host_alias}" ; then
	NUT_REPORT_TARGET(AUTOTOOLS_HOST_ALIAS, "${host_alias}", [host env spec we run on])
else
	if test -n "${host}" ; then
		NUT_REPORT_TARGET(AUTOTOOLS_HOST_ALIAS, "${host}", [host env spec we run on])
	fi
fi
if test -n "${build_alias}" ; then
	NUT_REPORT_TARGET(AUTOTOOLS_BUILD_ALIAS, "${build_alias}", [host env spec we built on])
else
	if test -n "${build}" ; then
		NUT_REPORT_TARGET(AUTOTOOLS_BUILD_ALIAS, "${build}", [host env spec we built on])
	fi
fi
if test -n "${target_alias}" ; then
	NUT_REPORT_TARGET(AUTOTOOLS_TARGET_ALIAS, "${target_alias}", [host env spec we built for])
else
	if test -n "${target}" ; then
		NUT_REPORT_TARGET(AUTOTOOLS_TARGET_ALIAS, "${target}", [host env spec we built for])
	fi
fi

if test -n "${host_cpu}" -a -n "${host_os}" ; then
	NUT_REPORT_TARGET(AUTOTOOLS_HOST_SHORT_ALIAS, "${host_cpu}-${host_os}", [host OS short spec we run on])
fi
if test -n "${build_cpu}" -a -n "${build_os}" ; then
	NUT_REPORT_TARGET(AUTOTOOLS_BUILD_SHORT_ALIAS, "${build_cpu}-${build_os}", [host OS short spec we built on])
fi
if test -n "${target_cpu}" -a -n "${target_os}" ; then
	NUT_REPORT_TARGET(AUTOTOOLS_TARGET_SHORT_ALIAS, "${target_cpu}-${target_os}", [host OS short spec we built for])
fi

AC_MSG_CHECKING([whether compiler suggests a MULTIARCH value])
dnl Recent GCC generally supports this call, although it often returns empty
dnl Some versions of CLANG also have it, others reject the unknown CLI switch
compiler_multiarch="`${CC} -print-multiarch 2>/dev/null`" || compiler_multiarch=""
if test -n "${compiler_multiarch}" ; then
	NUT_REPORT_TARGET(MULTIARCH_TARGET_ALIAS, "${compiler_multiarch}", [host multiarch spec we build for (as suggested by compiler being used)])
fi

dnl ----------------------------------------------------------------------
dnl Check the user and group to run as last, so we can use the paths configured
dnl above as data sources for default values if building an in-place replacement

AC_MSG_CHECKING(if requested user to run as)
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([user], [USERNAME], [(Unprivileged) user for programs normally started as root, typically 'nut' or 'ups'], [${RUN_AS_USER}], [platform-dependent, usually 'nobody'])

AS_CASE([${nut_with_user}],
	[yes|no], [AC_MSG_ERROR(invalid option --with(out)-user - see docs/configure.txt)],
	["${RUN_AS_USER}"], [
		 nut_user_given=no
		 AC_MSG_RESULT([default])
		],
		[RUN_AS_USER="${nut_with_user}"
		 nut_user_given=yes
		 AC_MSG_RESULT([specified])
		]
)
NUT_REPORT_SETTING([User to run as],
    RUN_AS_USER, "${RUN_AS_USER}", [User to switch to if started as root])

dnl Note: Technically daemons "run as" the primary GID of the user they de-levate into;
dnl but in simpler setups (stipulated by common packaging) this one is the "run as" GID too
AC_MSG_CHECKING(if requested group membership of user to own state files)
NUT_ARG_WITH_CUSTOM_DEFAULT_HELP([group], [GROUPNAME], [(Unprivileged) group membership for state files of drivers normally started as root, typically 'nut' or 'ups'], [${RUN_AS_GROUP}], [platform-dependent, usually 'nobody' or 'nogroup'])

AS_CASE([${nut_with_group}],
	[yes|no], [AC_MSG_ERROR(invalid option --with(out)-group - see docs/configure.txt)],
	["${RUN_AS_GROUP}"], [
		 nut_group_given=no
		 AC_MSG_RESULT([default])
		],
		[RUN_AS_GROUP="${nut_with_group}"
		 nut_group_given=yes
		 AC_MSG_RESULT([specified])
		]
)
NUT_REPORT_SETTING([Group of user to own state files],
    RUN_AS_GROUP, "${RUN_AS_GROUP}", [Group membership for state files of drivers normally started as root])

dnl check that --with-user is given if --with-group is given.
if test "${nut_user_given}" = "yes" -a "${nut_group_given}" = "no"; then
	AC_MSG_ERROR([If you specify --with-user, you also must specify --with-group])
elif test "${nut_user_given}" = "no" -a "${nut_group_given}" = "yes"; then
	AC_MSG_ERROR([If you specify --with-group, you also must specify --with-user])
fi

dnl ----------------------------------------------------------------------

dnl Current date
now=`TZ=UTC date +%Y-%m-%d`

AC_SUBST(now)
AC_SUBST(OS_NAME)
AC_SUBST(TREE_VERSION)
AC_SUBST(NUT_NETVERSION)
AC_SUBST(FORCE_NUT_VERSION)
AC_SUBST(GITLOG_START_POINT)
AC_SUBST(GITLOG_END_POINT)
AC_SUBST(NUT_SOURCE_GITREV)
AC_SUBST(NUT_SOURCE_GITREV_IS_RELEASE)
AC_SUBST(NUT_SOURCE_GITREV_IS_PRERELEASE)
AC_SUBST(NUT_SOURCE_GITREV_SEMVER)
AC_SUBST(NUT_SOURCE_GITREV_SEMVER_COLONS)
AC_SUBST(NUT_SOURCE_GITREV_SEMVER_UNDERSCORES)
AC_SUBST(NUT_SOURCE_GITREV_NUMERIC)
AC_SUBST(NUT_SOURCE_GITREV_NUMERIC_COLONS)
AC_SUBST(NUT_SOURCE_GITREV_NUMERIC_UNDERSCORES)
AC_SUBST(NUT_WEBSITE_BASE)
AC_SUBST(LIBSSL_CFLAGS)
AC_SUBST(LIBSSL_LIBS)
AC_SUBST(LIBSSL_LDFLAGS_RPATH)
AC_SUBST(LIBSSL_REQUIRES)
AC_SUBST(LIBGD_CFLAGS)
AC_SUBST(LIBGD_LDFLAGS)
AC_SUBST(LIBNETSNMP_CFLAGS)
AC_SUBST(LIBNETSNMP_LIBS)
AC_SUBST(LIBREGEX_LIBS)
AC_SUBST(LIBUSB_CFLAGS)
AC_SUBST(LIBUSB_LIBS)
AC_SUBST(LIBNEON_CFLAGS)
AC_SUBST(LIBNEON_LIBS)
AC_SUBST(LIBAVAHI_CFLAGS)
AC_SUBST(LIBAVAHI_LIBS)
AC_SUBST(LIBPOWERMAN_CFLAGS)
AC_SUBST(LIBPOWERMAN_LIBS)
AC_SUBST(LIBMODBUS_CFLAGS)
AC_SUBST(LIBMODBUS_LIBS)
AC_SUBST(LIBIPMI_CFLAGS)
AC_SUBST(LIBIPMI_LIBS)
AC_SUBST(LIBGPIO_CFLAGS)
AC_SUBST(LIBGPIO_LIBS)
AC_SUBST(LIBI2C_LIBS)
AC_SUBST(DOC_BUILD_LIST)
AC_SUBST(DOC_CHECK_LIST)
AC_SUBST(LIBWRAP_CFLAGS)
AC_SUBST(LIBWRAP_LIBS)
AC_SUBST(LIBLTDL_CFLAGS)
AC_SUBST(LIBLTDL_LIBS)
AC_SUBST(LIBSYSTEMD_CFLAGS)
AC_SUBST(LIBSYSTEMD_LIBS)
AC_SUBST(SYSTEMD_DAEMON_ARGS_UPSD)
AC_SUBST(SYSTEMD_DAEMON_TYPE_UPSD)
AC_SUBST(SYSTEMD_DAEMON_ARGS_UPSLOG)
AC_SUBST(SYSTEMD_DAEMON_TYPE_UPSLOG)
AC_SUBST(SYSTEMD_DAEMON_ARGS_UPSMON)
AC_SUBST(SYSTEMD_DAEMON_TYPE_UPSMON)
AC_SUBST(SYSTEMD_DAEMON_ARGS_DRIVER)
AC_SUBST(SYSTEMD_DAEMON_TYPE_DRIVER)
AC_SUBST(SYSTEMD_DAEMON_NOTIFYACCESS_DRIVER)
AC_SUBST(SYSTEMD_DAEMON_NOTIFYACCESS_UPSD)
AC_SUBST(SYSTEMD_DAEMON_NOTIFYACCESS_UPSLOG)
AC_SUBST(SYSTEMD_DAEMON_NOTIFYACCESS_UPSMON)
AC_SUBST(SYSTEMD_DAEMON_WATCHDOG_UPSD)
AC_SUBST(SYSTEMD_DAEMON_WATCHDOG_UPSLOG)
AC_SUBST(SYSTEMD_DAEMON_WATCHDOG_UPSMON)
AC_SUBST(SYSTEMD_DAEMON_WATCHDOG_DRIVER)
AC_SUBST(SYSTEMD_DAEMON_TIMEOUT_STOP_UPSMON)
AC_SUBST(SYSTEMD_AVAILABLE_EXEC_CONDITION)
AC_SUBST(SYSTEMD_TMPFILES_PROGRAM)
AC_SUBST(DRIVER_BUILD_LIST)
AC_SUBST(DRIVER_MAN_LIST)
AC_SUBST(DRIVER_MAN_LIST_PAGES)
AC_SUBST(DRIVER_INSTALL_TARGET)
AC_SUBST(BSDKVMPROCLIBS)
AC_SUBST(NETLIBS)
AC_SUBST(SERLIBS)
AC_SUBST(SEMLIBS)
AC_SUBST(PREFIX)
AC_SUBST(PIDPATH)
AC_SUBST(STATEPATH)
AC_SUBST(ALTPIDPATH)
dnl #Not in main codebase yet# AC_SUBST(ALTSTATEPATH)
AC_SUBST(CONFPATH)
AC_SUBST(CONFPATH_EXAMPLES)
AC_SUBST(POWERDOWNFLAG)
AC_SUBST(BINDIR)
AC_SUBST(LIBDIR)
AC_SUBST(PKGCONFIGDIR)
AC_SUBST(NUT_DATADIR, [`eval echo "${NUT_DATADIR}"`])
AC_SUBST(NUT_MANDIR, [`eval echo "${NUT_MANDIR}"`])
AC_SUBST(NUT_LIBEXECDIR, [`eval echo "${LIBEXECDIR}"`])
AC_SUBST(LDFLAGS_NUT_RPATH)
AC_SUBST(LDFLAGS_NUT_RPATH_CXX)
AC_SUBST(DRVPATH)
AC_SUBST(SBINDIR)
AC_SUBST(NUT_PORT)
AC_SUBST(RUN_AS_USER)
AC_SUBST(RUN_AS_GROUP)
AC_SUBST(SUN_LIBUSB)
AC_SUBST(WORDS_BIGENDIAN)
AC_SUBST(CGIEXECPATH)
AC_SUBST(cgiexecdir)
AC_SUBST(devddir)
AC_SUBST(driverexecdir)
AC_SUBST(freebsdquirksdir)
AC_SUBST(CGIDATAPATH)
AC_SUBST(htmlcgidir)
AC_SUBST(htmldocdir)
AC_SUBST(htmlmandir)
AC_SUBST(pkgconfigdir)
AC_SUBST(systemdsystemunitdir)
AC_SUBST(systemdsystempresetdir)
AC_SUBST(systemdshutdowndir)
AC_SUBST(systemdtmpfilesdir)
AC_SUBST(systemdsysusersdir)
AC_SUBST(auglensdir)
AC_SUBST(auglenstestsdir)
AC_SUBST(hotplugdir)
AC_SUBST(udevdir)

dnl On a related note to warning setup below, we limit the minimum C and C++
dnl standard versions to ones we actively strive to support (C99 and C++11,
dnl GNU dialects tend to work on more systems if supported by compiler there).
dnl It is assumed that on very old systems whose compilers do not know these
dnl standards (only support ANSI/C89/C90 or older), as well as for builds
dnl that explicitly specify a CFLAGS="-std=..." (for GCC/CLANG toolkits),
dnl nothing should get added to CFLAGS/CXXFLAGS by this method:
NUT_COMPILER_FAMILY_FLAGS_DEFAULT_STANDARD

dnl ---------------------------------------------------------------------
dnl Filter through known variants first, so automatic choices can be made.
dnl Note that clang identifies as gcc-compatible so should be probed first.
dnl TODO: Flip this default to "hard" when we clear existing codebase.
dnl Note: the "gcc-legacy" option is intentionally undocumented, it acts as
dnl least-surprise default if caller did not specify any --enable-warnings.
dnl Note: Currently the "gcc-minimal" mode below adapts to builds with
dnl C89/C90/ANSI mode to be less noisy. Keep this in mind if changing the
dnl default "nut_warning_difficulty" and/or the case handling below.
dnl NOTE: Until X-Mas 2021, the default was "minimal" (now "medium")
nut_warning_difficulty="medium"
AC_MSG_CHECKING([whether to pre-set warnings (from '${nut_enable_warnings}')])
AS_CASE(["${nut_enable_warnings}"],
    [no|all|gcc-legacy|gcc-minimal|clang-minimal|gcc-medium|clang-medium|gcc-hard|clang-hard], [],
    [clang], [nut_enable_warnings="${nut_enable_warnings}-${nut_warning_difficulty}"],
    [gcc], [
        AS_CASE(["${CFLAGS}"],
            [*89*|*90*|*ansi*], [nut_enable_warnings="${nut_enable_warnings}-minimal"],
            [nut_enable_warnings="${nut_enable_warnings}-${nut_warning_difficulty}"]
        )],
    [yes|auto|""], [
        AS_IF([test "${CLANGCC}" = "yes"], [nut_enable_warnings="clang-${nut_warning_difficulty}"],
            [AS_IF([test "${GCC}" = "yes"], [
                AS_CASE(["${CFLAGS}"],
                    [*89*|*90*|*ansi*], [nut_enable_warnings="gcc-minimal"],
                    [AS_CASE(["$CC_VERSION"],
                        [*" "1.*|*" "2.*|3.*|*" "4.0*|*" "4.1*|*" "4.2*|*" "4.3*], [
                            AC_MSG_WARN([Very old GCC in use, disabling warnings])
                            dnl #AS_IF([test x"${nut_enable_Werror}" = xauto], [nut_enable_Werror="no"])
                            nut_enable_Werror="no"
                            nut_enable_warnings="no"],
                        [*" "4.4*|*" "4.5*|*" "4.6*|*" "4.7*|*" "4.8*], [nut_enable_warnings="gcc-legacy"],
                        [nut_enable_warnings="gcc-${nut_warning_difficulty}"]
                    )]
                )], [nut_enable_warnings="all"])
            ])
        ],
    [hard|auto-hard|auto=hard], [
        AS_IF([test "${CLANGCC}" = "yes"], [nut_enable_warnings="clang-hard"],
            [AS_IF([test "${GCC}" = "yes"], [nut_enable_warnings="gcc-hard"], [nut_enable_warnings="all"])
            ])
        ],
    [medium|auto-medium|auto=medium], [
        AS_IF([test "${CLANGCC}" = "yes"], [nut_enable_warnings="clang-medium"],
            [AS_IF([test "${GCC}" = "yes"], [nut_enable_warnings="gcc-medium"], [nut_enable_warnings="all"])
            ])
        ],
    [minimal|auto-minimal|auto=minimal], [
        AS_IF([test "${CLANGCC}" = "yes"], [nut_enable_warnings="clang-minimal"],
            [AS_IF([test "${GCC}" = "yes"], [nut_enable_warnings="gcc-minimal"], [nut_enable_warnings="all"])
            ])
        ],
    [legacy], [AS_IF([test "${GCC}" = "yes"], [nut_enable_warnings="gcc-legacy"], [nut_enable_warnings="no"])],
    [AC_MSG_WARN([Unsupported variant for --enable-warnings=${nut_enable_warnings}, ignored])
     nut_enable_warnings="no"
    ]
)
AC_MSG_RESULT([${nut_enable_warnings}])

dnl # Nothing special for gcc - we tend to survive it with GNU standard >= 99
dnl # and fail with strict C standard. Suggestions welcome for "gcc-hard" to
dnl # make a difference.
dnl # Note that "medium" and "hard" settings tend to trigger warnings also
dnl # from system headers, so we try to avoid them, using "-isystem path"
dnl # pre-set in our `m4/nut_compiler_family.m4` script:
dnl #    https://stackoverflow.com/questions/36355232/disable-certain-warnings-for-system-headers
dnl # and "-Wno-system-headers" below.
dnl # Some of the compiler flags (including those added by pkg-config of some
dnl # third-party dependency packages) can upset older compiler releases which
dnl # did not yet support those. Flags like "-Wno-unknown-warning" for GCC or
dnl # "-Wno-unknown-warning-option" for CLANG should take care of that at least
dnl # for toolkit versions that support these - set in NUT_COMPILER_FAMILY_FLAGS
dnl # Majority of sanity checks are enabled by "-Wextra" on both GCC and CLANG
dnl # and "-Weverything" additionally on CLANG. They are impractically picky,
dnl # especially with fallout from system headers that we can not impact anyway
dnl # so the "difficulty level" pre-sets exclude certain warning classes from
dnl # that report.
dnl ### Special exclusion picks for clang-hard:
dnl # -Wno-unused-macros -- system headers define a lot of stuff we do not use,
dnl #    gotta be fatal right?
dnl # -Wno-reserved-id-macro -- configure script tends to define _GNU_SOURCE_,
dnl #    __EXTENSIONS__ etc. which are underscored and reserved for compilers
dnl # -Wno-padded -- NSPR and NSS headers get to issue lots of that
dnl # -Wno-c++98-compat-pedantic -Wno-c++98-compat -- our C++ code uses nullptr
dnl #    as requested by newer linters, and C++98 does not. We require C++11
dnl #    or newer anyway, and skip building C++ library and test otherwise.
dnl # -Wno-exit-time-destructors -- "(static) const something" items would be
dnl #    de-allocated en-masse when the program exits, not GC'ed at run-time.
dnl #    Oh well...
dnl # -Wno-fuse-ld-path -- not much in our control what recipes the autotools
dnl #    on the build host generate... this tries to avoid failures due to:
dnl #      clang-13: error: '-fuse-ld=' taking a path is deprecated.
dnl #      Use '--ld-path=' instead [-Werror,-Wfuse-ld-path]
dnl # -Wno-unsafe-buffer-usage -- clang-16 introduced a check too smart for
dnl #    its own good. It detects use of pointer aritmetics as arrays are
dnl #    walked, which is indeed potentially dangerous. And also is nearly
dnl #    unavoidable in C (at least not without major rewrites of the world).
dnl # -Wno-documentation-unknown-command -fcomment-block-commands=retval --
dnl #    some clang versions sanity-check Doxygen style comments, but do not
dnl #    recognize "\retval" key word. These options try to both ignore the
dnl #    problematic area, and to add it as recognized (TODO: scripted check
dnl #    for abilities of the current build's compiler instead)
dnl # -Wno-missing-include-dirs -- do not break on missing include directories,
dnl #    whether from user-provided config options, or pkg-config, or our own
dnl #    ci_build.sh preparations (e.g. -I${top_srcdir}/tmp/include when it
dnl #    is not populated yet)
dnl ### Special exclusion picks for clang-medium (same as hard, plus...):
dnl # -Wno-global-constructors -- using "const something" out of method context
dnl #    potentially impacts start-up time and may be prone to race conditions
dnl #    (for non-trivial interconnected objects), better be re-architected.
dnl # -Wno-float-conversion -Wno-double-promotion -Wno-implicit-float-conversion
dnl #    -- reduce noise due to floating-point literals like "3.14" being a C
dnl #    double type (a "3.14f" literal is a C float) cast implicitly into
dnl #    float variables. Also variadic functions like printf() cast their
dnl #    floating-point arguments into double (and small integer types into
dnl #    "int") which then confuses pedantic checks of printf("%f", floatval).
dnl # -Wno-conversion -- similarly for error: implicit conversion loses
dnl #    floating-point precision: 'double' to 'float' [-Werror,-Wconversion]
dnl #      max_output = atof(sValue);
dnl # -Wno-cast-qual -- our code calls some library methods in ways which use
dnl #    a "const char *" as a "char *" or vice-versa. Sometimes these method
dnl #    signatures differ between dependency releases; sometimes they just
dnl #    happened too hard to unravel cleanly and add more warnings.
dnl #    This exclusion may be removed after common warnings are solved,
dnl #    to allow progress on rectifying these cases next.
dnl # -Wno-incompatible-pointer-types-discards-qualifiers -- our code often
dnl #    defines (char*) as the type for struct fields and method arguments,
dnl #    but initializes/passes (char[]) variables or fixed strings.
dnl #    This makes at least clang-3.4 quite upset and noisy (seems newer
dnl #    versions care less about this situation).
dnl # -Wno-disabled-macro-expansion -- some system definitions of strncmp()
dnl #    and other routines are in fact recursive macros. The -Weverything
dnl #    mode of clang(-3.4) disables their handling, unless told otherwise.
dnl # -Wno-incompatible-function-pointer-types-strict -- some system definitions
dnl #    of methods for signals are not compatible with even those systems'
dnl #    definitions of default signals, e.g. void vs. int arguments:
dnl #        #define SIG_IGN (void (*)())1
dnl #        extern void (*signal(int, void (*)(int)))(int);
dnl #    (NUT signal handler methods do have the int signal number)
dnl #    This is currently quiesced for clang-17; better solutions are welcome.
dnl # -Wno-nullable-to-nonnull-conversion -- newer system headers are tagged
dnl #    with hints about _Nullable vs. _Nonnull pointers. The general idea
dnl #    is respectable for memory safety and could be addressed for true old
dnl #    C99 toolkits and current language spec e.g. with macros... later.
dnl #    Currently it is more like whack-a-mole as distros update headers.
dnl # -Wno-c11-extensions -- clang-21 on Ubuntu 26.04 at least complains a lot
dnl #    about system headers (string.h, cdefs.h, etc.) using __glibc_const_generic
AS_CASE(["${nut_enable_warnings}"],
    [all], [
        CFLAGS="${CFLAGS} -Wall"
        CXXFLAGS="${CXXFLAGS} -Wall"
        ],
    [clang-hard], [
        CFLAGS="${CFLAGS} -ferror-limit=0 -Wno-system-headers -Wno-missing-include-dirs -Wall -Wextra -Weverything -Wno-disabled-macro-expansion -Wno-unused-macros -Wno-reserved-id-macro -Wno-padded -Wno-documentation -fcomment-block-commands=retval -Wno-documentation-unknown-command -Wno-cast-qual -Wno-c11-extensions -pedantic -Wno-fuse-ld-path -Wno-unsafe-buffer-usage"
        CXXFLAGS="${CXXFLAGS} -ferror-limit=0 -Wno-system-headers -Wno-missing-include-dirs -Wall -Wextra -Weverything -Wno-disabled-macro-expansion -Wno-unused-macros -Wno-reserved-id-macro -Wno-padded -Wno-documentation -fcomment-block-commands=retval -Wno-documentation-unknown-command -Wno-cast-qual -Wno-c++98-compat-pedantic -Wno-c++98-compat -Wno-exit-time-destructors -Wno-fuse-ld-path -Wno-unsafe-buffer-usage"
        ],
    [clang-medium], [
        CFLAGS="${CFLAGS} -ferror-limit=0 -Wno-system-headers -Wno-missing-include-dirs -Wall -Wextra -Weverything -Wno-disabled-macro-expansion -Wno-unused-macros -Wno-reserved-id-macro -Wno-padded -Wno-documentation -fcomment-block-commands=retval -Wno-documentation-unknown-command -Wno-cast-qual -Wno-c11-extensions -pedantic -Wno-fuse-ld-path -Wno-unsafe-buffer-usage -Wno-float-conversion -Wno-double-promotion -Wno-implicit-float-conversion -Wno-conversion -Wno-incompatible-pointer-types-discards-qualifiers -Wno-incompatible-function-pointer-types-strict -Wno-nullable-to-nonnull-conversion"
        CXXFLAGS="${CXXFLAGS} -ferror-limit=0 -Wno-system-headers -Wno-missing-include-dirs -Wall -Wextra -Weverything -Wno-disabled-macro-expansion -Wno-unused-macros -Wno-reserved-id-macro -Wno-padded -Wno-documentation -fcomment-block-commands=retval -Wno-documentation-unknown-command -Wno-cast-qual -Wno-c++98-compat-pedantic -Wno-c++98-compat -Wno-exit-time-destructors -Wno-global-constructors -Wno-fuse-ld-path -Wno-unsafe-buffer-usage -Wno-nullable-to-nonnull-conversion"
        ],
    [clang-minimal], [
        CFLAGS="${CFLAGS} -ferror-limit=0 -Wall -Wextra -Wno-documentation -Wno-documentation-unknown-command -fcomment-block-commands=retval"
        CXXFLAGS="${CXXFLAGS} -ferror-limit=0 -Wall -Wextra -Wno-documentation -Wno-documentation-unknown-command -fcomment-block-commands=retval"
        ],
    [gcc-legacy], [CFLAGS="${CFLAGS} -Wall -Wsign-compare"],
    [gcc-minimal], [
        dnl Builds with C89 (and aliases) are quite noisy for C99+ syntax used
        dnl in NUT. The minimal-warnings should not complain in these builds.
        dnl To make matters worse, many modern OS and third-party library
        dnl headers can not be used with "C90 + pedantic" mode of GCC, either.
        CFLAGS="${CFLAGS} -Wall -Wsign-compare"
        CXXFLAGS="${CXXFLAGS} -Wall -Wextra"
        AS_CASE(["${CFLAGS}"],
            [*89*|*90*|*ansi*], [],
            [CFLAGS="${CFLAGS} -Wextra -pedantic"]
        )
        ],
    [gcc-medium|gcc-hard], [
        CFLAGS="${CFLAGS} -Wno-system-headers -Wall -Wextra -Wsign-compare"
        CXXFLAGS="${CXXFLAGS} -Wno-system-headers -Wall -Wextra"
        AS_CASE(["${CFLAGS}"],
            [*89*|*90*|*ansi*], [],
            [CFLAGS="${CFLAGS} -pedantic"]
        )
        ]
)

AS_IF([test x"${nut_enable_warnings}" != xno || test x"${nut_enable_Werror}" != xno],
    [AS_IF([test "x${CLANGCC}" = "xyes" || test "x${GCC}" = "xyes"],
        [AS_CASE(["${target_os}"],
            [*mingw*], [
                AC_MSG_NOTICE(
[GCC on WIN32 builds warns about '%lld' etc. via PRId64 etc.
even though modern libraries support long-long printing
in practice (older ones did not - hence the warning).
Forcing "-Wno-format" into warnings options.
])
                CFLAGS="${CFLAGS} -Wno-format"
                CXXFLAGS="${CXXFLAGS} -Wno-format"
            ]
        )
    ])
])

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING([whether to make warnings fatal])
AS_CASE(["${nut_enable_Werror}"],
    [yes|auto], [
        CFLAGS="${CFLAGS} -Werror"
        CXXFLAGS="${CXXFLAGS} -Werror"
        ],
    [no], [
        CFLAGS="${CFLAGS} -Wno-error"
        CXXFLAGS="${CXXFLAGS} -Wno-error"
        ]
)
AC_MSG_RESULT([${nut_enable_Werror}])

dnl ---------------------------------------------------------------------
dnl Some compilers (e.g. older clang-3.4) have issues with built-in methods
dnl that are implemented as macros in system headers -- but only for some
dnl sources like snmp-ups.c, nutscan-serial.c, scan_eaton_serial.c, serial.c,
dnl scan_avahi.c, scan_xml_http.c, scan_snmp.c... (Seems they all refer to
dnl -DNETSNMP_USE_INLINE among other options, and tends to happen more with
dnl OpenSSL-enabled builds). Check if we like them?
AC_CHECK_HEADER([string.h],
    [AC_LANG_PUSH([C])
     CFLAGS_SAVED="${CFLAGS}"
     CFLAGS_BUILTIN_STR="-fno-builtin-strchr -fno-builtin-strcmp -fno-builtin-strncmp"
     CFLAGS="${CFLAGS} -Werror -Wunreachable-code ${LIBNETSNMP_CFLAGS} ${LIBLTDL_CFLAGS} ${LIBNEON_CFLAGS} ${LIBSSL_CFLAGS}"
     AC_MSG_CHECKING([whether we should disable string built-ins])
     dnl AC_DEFINE([HAVE_STRING_H], [1], [Define to 1 if you have <string.h>.])
     AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
            [[#include <string.h>
            ]], [char *s = "v1", c = '%';
if (strcmp(s, "v1") != 0) return 1;
if (strchr(s, '1') == NULL) return 1;
if (strchr(s, c) != NULL) return 1
/* no ";return 0;" here - autoconf adds one */
            ])],
        [CFLAGS="${CFLAGS_SAVED}"
         AC_MSG_RESULT([no, they are not a problem])],
        [CFLAGS="${CFLAGS_BUILTIN_STR} ${CFLAGS}"
         AC_COMPILE_IFELSE(
            [AC_LANG_PROGRAM(
                [[#include <string.h>
                ]], [char *s = "v1", c = '%';
if (strcmp(s, "v1") != 0) return 1;
if (strchr(s, '1') == NULL) return 1;
if (strchr(s, c) != NULL) return 1
/* no ";return 0;" here - autoconf adds one */
                ])],
            [CFLAGS="${CFLAGS_BUILTIN_STR} ${CFLAGS_SAVED}"
             AC_MSG_RESULT([yes, this solves a problem])],
            [CFLAGS="${CFLAGS_SAVED} -Werror -Wno-unreachable-code ${LIBNETSNMP_CFLAGS} ${LIBLTDL_CFLAGS} ${LIBNEON_CFLAGS} ${LIBSSL_CFLAGS}"
             AC_COMPILE_IFELSE(
                [AC_LANG_PROGRAM(
                    [[#include <string.h>
                    ]], [char *s = "mibs", c = '%';
/* Macro version of strcmp() has problems with strings shorter than
 * 3 or 4 bytes, so to avoid nailing "-Warray-bounds" as well,
 * here we just test for longer strings - existing NUT sources were
 * fixed for this situation already */
if (strcmp(s, "mibs") != 0) return 1;
if (strchr(s, 'b') == NULL) return 1;
if (strchr(s, c) != NULL) return 1
/* no ";return 0;" here - autoconf adds one */
                    ])],
                [dnl CFLAGS="${CFLAGS_SAVED} -Wno-unreachable-code"
                 dnl NOTE: Empirically, constrain to just LIBNETSNMP_CFLAGS
                 CFLAGS="${CFLAGS_SAVED}"
                 LIBLTDL_CFLAGS="${LIBLTDL_CFLAGS} -Wno-unreachable-code"
                 LIBNETSNMP_CFLAGS="${LIBNETSNMP_CFLAGS} -Wno-unreachable-code"
                 AC_MSG_RESULT([no, but -Wno-unreachable-code solves the problem for this compiler])],
                [CFLAGS="${CFLAGS_SAVED}"
                 AC_MSG_RESULT([no, this does not solve the problem or is not supported])
                ])
            ])
        ]
     )
     AC_LANG_POP([C])]
)

dnl Similar to above, for s_addr = htonl((ntohl(ip->start.s_addr) + 1));
dnl which causes "shadowed local variable" as (re-)defined in nested macros.
dnl Technically also needs to `#include <netinet/in.h>` for struct in_addr
dnl but that should be pulled by inet.h anyway
AC_CHECK_HEADER([arpa/inet.h],
    [AC_LANG_PUSH([C])
     CFLAGS_SAVED="${CFLAGS}"
     CFLAGS_BUILTIN_NTOHL="-fno-builtin-htonl -fno-builtin-ntohl"
     CFLAGS="${CFLAGS} -Werror -Wunreachable-code -Wshadow ${LIBNETSNMP_CFLAGS} ${LIBLTDL_CFLAGS} ${LIBNEON_CFLAGS} ${LIBSSL_CFLAGS}"
     AC_MSG_CHECKING([whether we should disable htonl/ntohl built-ins])
     dnl AC_DEFINE([HAVE_ARPA_INET_H], [1], [Define to 1 if you have <arpa/inet.h>.])
     AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
            [[#include <arpa/inet.h>
            ]], [struct in_addr sin = {0};
sin.s_addr = htonl((ntohl(sin.s_addr) + 1))
/* no ";return 0;" here - autoconf adds one */
            ])],
        [CFLAGS="${CFLAGS_SAVED}"
         AC_MSG_RESULT([no, they are not a problem])],
        [CFLAGS="${CFLAGS_BUILTIN_NTOHL} ${CFLAGS}"
         AC_COMPILE_IFELSE(
            [AC_LANG_PROGRAM(
                [[#include <arpa/inet.h>
                ]], [struct in_addr sin = {0};
sin.s_addr = htonl((ntohl(sin.s_addr) + 1))
/* no ";return 0;" here - autoconf adds one */
                ])],
            [CFLAGS="${CFLAGS_BUILTIN_NTOHL} ${CFLAGS_SAVED}"
             AC_MSG_RESULT([yes, this solves a problem])],
            [CFLAGS="${CFLAGS_SAVED} -Werror -Wno-shadow ${LIBNETSNMP_CFLAGS} ${LIBLTDL_CFLAGS} ${LIBNEON_CFLAGS} ${LIBSSL_CFLAGS}"
             AC_COMPILE_IFELSE(
                [AC_LANG_PROGRAM(
                    [[#include <arpa/inet.h>
                    ]], [struct in_addr sin = {0};
sin.s_addr = htonl((ntohl(sin.s_addr) + 1))
                    ])],
                [CFLAGS="${CFLAGS_SAVED}"
                 LIBLTDL_CFLAGS="${LIBLTDL_CFLAGS} -Wno-shadow"
                 LIBNETSNMP_CFLAGS="${LIBNETSNMP_CFLAGS} -Wno-shadow"
                 AC_MSG_RESULT([no, but -Wno-shadow solves the problem for this compiler])],
                [CFLAGS="${CFLAGS_SAVED}"
                 AC_MSG_RESULT([no, this does not solve the problem or is not supported])
                ])
            ])
        ]
     )
     AC_LANG_POP([C])]
)

dnl Finally restore warnings settings that the caller might have provided in CFLAGS etc
NUT_POP_WARNINGS

dnl ---------------------------------------------------------------------
dnl Due to possibly repetitive content, generate unique settings
dnl relative to the top_builddir (distcheck and all):
AC_MSG_CHECKING([for top build dir for this configure run])
TOP_BUILDDIR=""
AS_IF([test -n "${ac_abs_top_builddir}" && test -d "${ac_abs_top_builddir}"],
    [TOP_BUILDDIR="${ac_abs_top_builddir}"],
    [AS_IF([test -n "${ac_pwd}" && test -d "${ac_pwd}"],
        [TOP_BUILDDIR="${ac_pwd}"],
        [TOP_BUILDDIR="`dirname \"$0\"`"
         TOP_BUILDDIR="`cd \"$TOP_BUILDDIR\" && pwd`" || AC_MSG_ERROR([Can not detect TOP_BUILDDIR])]
    )]
)
dnl Quoted in case someone copy-pastes this path and it has whitespaces:
AC_MSG_RESULT(['${TOP_BUILDDIR}'])

ABS_TOP_BUILDDIR="`cd \"${TOP_BUILDDIR}\" && pwd`" || AC_MSG_ERROR([Can not detect ABS_TOP_BUILDDIR])
ABS_TOP_SRCDIR="`cd \"${abs_srcdir}\" && pwd`" || AC_MSG_ERROR([Can not detect ABS_TOP_SRCDIR])
AM_CONDITIONAL([BUILDING_IN_TREE], [test "${ABS_TOP_BUILDDIR}" = "${ABS_TOP_SRCDIR}"])

dnl When building ON Windows (mingw/MSYS2, cygwin, etc.) fudge these
dnl path strings back to what native OS methods would recognize.
AS_CASE([${target_os}],
    [*mingw*], [
        AC_MSG_NOTICE([Will try to resolve Windows paths to ABS_TOP_SRCDIR and ABS_TOP_BUILDDIR with 'cygpath -ma' or mingw/msys 'pwd -W' tool (would fail if not a native build)])

        dnl Cygwin path resolver; note it may have already been found
        dnl by autotools core code earlier in the generated script:
        AC_CHECK_TOOL([CYGPATH], [cygpath], [none])
        AS_IF([test "x${CYGPATH}" != "xnone" && test x"`${CYGPATH} -m -a .`" != x], [
            tmp="`${CYGPATH} -m -a \"${ABS_TOP_BUILDDIR}\" | sed -e 's,/,\\\\\\\\,g'`" && test -n "$tmp" && test -d "$tmp" && ABS_TOP_BUILDDIR="$tmp"
            tmp="`${CYGPATH} -m -a \"${ABS_TOP_SRCDIR}\" | sed 's,/,\\\\\\\\,g'`" && test -n "$tmp" && test -d "$tmp" && ABS_TOP_SRCDIR="$tmp"
        ],[
            dnl MSYS pwd with -W option to resolve
            AC_CHECK_TOOL([PWDTOOL], [pwd], [none])
            AS_IF([test "x${PWDTOOL}" != "xnone" && test x"`${PWDTOOL} -W`" != x], [
                tmp="`(cd \"${ABS_TOP_BUILDDIR}\" && ${PWDTOOL} -W) | sed 's,/,\\\\\\\\,g'`" && test -n "$tmp" && test -d "$tmp" && ABS_TOP_BUILDDIR="$tmp"
                tmp="`(cd \"${ABS_TOP_SRCDIR}\" && ${PWDTOOL} -W) | sed 's,/,\\\\\\\\,g'`" && test -n "$tmp" && test -d "$tmp" && ABS_TOP_SRCDIR="$tmp"
            ])
        ])

        AC_MSG_NOTICE([FWIW, assuming ABS_TOP_SRCDIR="$ABS_TOP_SRCDIR" and ABS_TOP_BUILDDIR="$ABS_TOP_BUILDDIR"])
])

dnl Use these at best for tests (e.g. nutconf, NIT), not production code:
AC_DEFINE_UNQUOTED([ABS_TOP_SRCDIR], ["${ABS_TOP_SRCDIR}"], [NUT source directory when the build was configured])
AC_DEFINE_UNQUOTED([ABS_TOP_BUILDDIR], ["${ABS_TOP_BUILDDIR}"], [NUT build directory when the build was configured])

AC_SUBST(ABS_TOP_SRCDIR)
AC_SUBST(ABS_TOP_BUILDDIR)

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING([whether to install External API integration script: Enphase Monitor])
nut_with_extapi_enphase="no"
NUT_ARG_ENABLE([extapi-enphase], [(yes|no|auto)], [Enable installation of integration script for External API: Enphase Monitor], [no])

AS_CASE([${nut_enable_extapi_enphase}],
	[""], [nut_enable_extapi_enphase="yes"],
	[auto|no], [],
		[AC_MSG_ERROR([Unexpected argument for --enable-extapi-enphase=${nut_enable_extapi_enphase}])]
)

if test x"$nut_enable_extapi_enphase" != xno ; then
	dnl Depends on usability of further programs and bash version
	dnl Luckily the script checks that itself, before handling CLI args
	/usr/bin/env bash "${ABS_TOP_SRCDIR}/scripts/external_apis/enphase/enphase-monitor.in" --help >/dev/null \
	&& nut_can_extapi_enphase="yes" \
	|| nut_can_extapi_enphase="no"

	if test x"$nut_enable_extapi_enphase" = xyes && x"$nut_can_extapi_enphase" = xno ; then
		AC_MSG_ERROR([Caller required installation --enable-extapi-enphase but the system can not run it])
	fi
	nut_enable_extapi_enphase="${nut_can_extapi_enphase}"
fi
AC_MSG_RESULT([${nut_enable_extapi_enphase}])
AM_CONDITIONAL(ENABLE_EXTAPI_ENPHASE, test x"$nut_enable_extapi_enphase" = x"yes")

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING([whether to customize ${TOP_BUILDDIR}/scripts/systemd/nut-common-tmpfiles.conf.in for this system])
dnl TOTHINK: Some distributions make the directories below owned
dnl by "root:${RUN_AS_GROUP}" with 77x permissions. Is it safer?..
AS_IF([test -n "$systemdtmpfilesdir"],
    [mkdir -p "${TOP_BUILDDIR}"/scripts/systemd
     cat > "${TOP_BUILDDIR}"/scripts/systemd/nut-common-tmpfiles.conf.in << EOF
# Network UPS Tools (NUT) systemd integration
# Distributed under the terms of GPLv2+
# See https://networkupstools.org/
# and https://github.com/networkupstools/nut/

# See also: https://github.com/networkupstools/nut/wiki/Technicalities:-Work-with-PID-and-state-file-paths#pidpath-altpidpath-statepath
# State file (e.g. upsd to driver pipes) and PID file location for NUT:
d @STATEPATH@ 0770 @RUN_AS_USER@ @RUN_AS_GROUP@ - -
# Default PIPEFN and LOCKFN locations per upssched.conf:
d @STATEPATH@/upssched 0770 @RUN_AS_USER@ @RUN_AS_GROUP@ - -
X @STATEPATH@
EOF
    AS_IF([test "$STATEPATH" != "$PIDPATH"],
        [AS_CASE(["${PIDPATH}"],
            [*/run|*/tmp|*/shm], [], dnl Do not intrude into system paths; TODO: add more if appropriate for some Linux distro
            [cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-tmpfiles.conf.in << EOF
# Primarily used by upsmon and upslog, possibly running as root:
EOF
             AS_IF([test -z "$ALTPIDPATH" -o x"$ALTPIDPATH" != x"${PIDPATH}" && test -z "$ALTSTATEPATH" -o x"$ALTSTATEPATH" != x"${PIDPATH}"], [
                cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-tmpfiles.conf.in << EOF
d @PIDPATH@ 0750 root @RUN_AS_GROUP@ - -
EOF
                ], [
                cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-tmpfiles.conf.in << EOF
d @PIDPATH@ 0770 @RUN_AS_USER@ @RUN_AS_GROUP@ - -
EOF
                ])

            cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-tmpfiles.conf.in << EOF
X @PIDPATH@
EOF
])])
    AS_IF([test -n "$ALTPIDPATH" && test "$STATEPATH" != "$ALTPIDPATH" && test "$PIDPATH" != "$ALTPIDPATH"],
        [cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-tmpfiles.conf.in << EOF
# Should be used as upsd and driver PID file location for NUT
# (if ALTPIDPATH differs from STATEPATH):
d @ALTPIDPATH@ 0770 @RUN_AS_USER@ @RUN_AS_GROUP@ - -
X @ALTPIDPATH@
EOF])
    dnl Generally added to support some forks
    AS_IF([test -n "$ALTSTATEPATH" && test "$STATEPATH" != "$ALTSTATEPATH" && test "$ALTSTATEPATH" != "$ALTPIDPATH" && test "$PIDPATH" != "$ALTSTATEPATH"],
        [cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-tmpfiles.conf.in << EOF
# Some NUT variants also maintain an ALTSTATEPATH:
d @ALTSTATEPATH@ 0770 @RUN_AS_USER@ @RUN_AS_GROUP@ - -
X @ALTSTATEPATH@
EOF])
])
AC_MSG_RESULT([done])

dnl ---------------------------------------------------------------------
AC_MSG_CHECKING([whether to customize ${TOP_BUILDDIR}/scripts/systemd/nut-common-sysusers.conf.in for this system])
AS_IF([test -n "$systemdsysusersdir"],
    [mkdir -p "${TOP_BUILDDIR}"/scripts/systemd
     cat > "${TOP_BUILDDIR}"/scripts/systemd/nut-common-sysusers.conf.in << EOF
# Network UPS Tools (NUT) systemd integration
# Distributed under the terms of GPLv2+
# See https://networkupstools.org/
# and https://github.com/networkupstools/nut/
EOF
    AS_IF([test -n "${RUN_AS_USER}" && test x"${RUN_AS_USER}" != xnobody && test x"${RUN_AS_USER}" != xroot],
        dnl Locked users ('!') are supported since v257
        AS_IF([test x"$have_PKG_CONFIG" = xyes && $PKG_CONFIG --atleast-version=257 systemd 2>/dev/null], [
            cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-sysusers.conf.in << EOF
u! @RUN_AS_USER@ - - @STATEPATH@
EOF
        ], [
            cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-sysusers.conf.in << EOF
u @RUN_AS_USER@ - - @STATEPATH@
EOF
        ])
    )
    AS_IF([test -n "${RUN_AS_GROUP}" && test x"${RUN_AS_GROUP}" != xnobody && test x"${RUN_AS_GROUP}" != xnogroup && test x"${RUN_AS_GROUP}" != xroot],
        [cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-sysusers.conf.in << EOF
g @RUN_AS_GROUP@
EOF])
    AS_IF([test -n "${RUN_AS_USER}" && test x"${RUN_AS_USER}" != xnobody && test x"${RUN_AS_USER}" != xroot && test -n "${RUN_AS_GROUP}" && test x"${RUN_AS_GROUP}" != xnobody && test x"${RUN_AS_GROUP}" != xnogroup && test x"${RUN_AS_GROUP}" != xroot],
        [cat >> "${TOP_BUILDDIR}"/scripts/systemd/nut-common-sysusers.conf.in << EOF
m @RUN_AS_USER@ @RUN_AS_GROUP@
EOF])
])
AC_MSG_RESULT([done])

dnl # ccache versions 4.5 and newer support namespacing of the objects
dnl # to facilitate more targeted eviction with --evict-namespace and
dnl # perhaps --evict-older-than options. Here we bolt a namespace with
dnl # NUT as the project and CPU architecture for resulting binaries;
dnl # maybe we might use distro as well but some overlaps may be possible
dnl # that result in same objects for different-looking build roots.
dnl # Note this is enabled by default (explicit --without-... disables it).
dnl # Has practical effect if NUT_AM_MAKE_CAN_EXPORT test is successful.
AS_IF([test x"${CCACHE_NAMESPACE}" = x], [
	CCACHE_NAMESPACE="nut"
	dnl # Variables in this list are defined earlier in the script
	for T in "${compiler_multiarch}" "${target_alias}" "${target}" "${target_cpu}-${target_os}" ; do
		if test x"$T" != x -a x"$T" != x- ; then
			CCACHE_NAMESPACE="${CCACHE_NAMESPACE}:${T}"
			break
		fi
	done
	unset T
])
NUT_ARG_WITH([CCACHE_NAMESPACE], [yes|no|auto|NAMESPACE], [Whether/which ccache namespace to use for built binaries, typically 'nut:${autotools_target}'], [auto])
AS_CASE([${nut_with_CCACHE_NAMESPACE}],
	[no],	[CCACHE_NAMESPACE=""],
	[yes],	[AS_IF([text x"${CCACHE_NAMESPACE}" = x], [AC_MSG_ERROR([--with-CCACHE_NAMESPACE can not be fulfilled on this system])])],	dnl Else use user envvar or calculation above
	[auto],	[],	dnl Use user envvar or calculation above
		[CCACHE_NAMESPACE="${nut_with_CCACHE_NAMESPACE}"]
)
NUT_REPORT_TARGET(CCACHE_NAMESPACE, "${CCACHE_NAMESPACE}", [ccache namespace tag (if ccache is used and new enough)])
AS_IF([test x"$CCACHE_NAMESPACE" != x -a x"$NUT_AM_MAKE_CAN_EXPORT" != x], [
	AC_MSG_WARN([CCACHE_NAMESPACE setting may have no effect: this make implementation seems to not support "export VAR=VAL" syntax])
])

dnl # Mark it as a "precious variable", for more details see
dnl # https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Setting-Output-Variables.html
AC_ARG_VAR(CCACHE_NAMESPACE)

dnl # Also list some other ccache options which ci_build.sh can fiddle with.
dnl # While that script "exports" them so it can call both configuration and
dnl # the build, their values may be unknown when a developer re-runs "make".
dnl # Normally most of the options would persist under $CCACHE_DIR/ccache.conf
dnl # and we would not pass them via envvars.
AC_ARG_VAR(CCACHE_BASEDIR)
AC_ARG_VAR(CCACHE_DIR)
AC_ARG_VAR(CCACHE_PATH)

dnl Some versions of ccache take poorly to an exported empty CCACHE_DIR etc.
dnl Avoid exporting them if not set at the configure time (assuming ci_build.sh
dnl integration or user's shell profile sets them persistently)
AS_IF([test x"${CCACHE_NAMESPACE-}" = x], [NUT_AM_EXPORT_CCACHE_NAMESPACE="#"], [NUT_AM_EXPORT_CCACHE_NAMESPACE=""])
AC_SUBST(NUT_AM_EXPORT_CCACHE_NAMESPACE)
AS_IF([test x"${CCACHE_BASEDIR-}" = x], [NUT_AM_EXPORT_CCACHE_BASEDIR="#"], [NUT_AM_EXPORT_CCACHE_BASEDIR=""])
AC_SUBST(NUT_AM_EXPORT_CCACHE_BASEDIR)
AS_IF([test x"${CCACHE_DIR-}" = x], [NUT_AM_EXPORT_CCACHE_DIR="#"], [NUT_AM_EXPORT_CCACHE_DIR=""])
AC_SUBST(NUT_AM_EXPORT_CCACHE_DIR)

dnl Application of PATH_DURING_CONFIGURE is also fenced by NUT_AM_EXPORT_CCACHE_PATH:
AS_IF([test x"${CCACHE_PATH-}" = x], [NUT_AM_EXPORT_CCACHE_PATH="#"], [NUT_AM_EXPORT_CCACHE_PATH=""])
AC_SUBST(NUT_AM_EXPORT_CCACHE_PATH)
PATH_DURING_CONFIGURE="$PATH"
AC_SUBST(PATH_DURING_CONFIGURE)

dnl ---------------------------------------------------------------------
dnl Some binaries, like CPPUNIT tests, have similar flags already added
dnl We might wipe their specific options below if consistently applying
dnl debug-friendly options to everything
AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) CONFIG_CFLAGS='${CONFIG_CFLAGS}'])
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) CONFIG_CXXFLAGS='${CONFIG_CXXFLAGS}'])
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) CONFIG_CPPFLAGS='${CONFIG_CPPFLAGS}'])
    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) CONFIG_LDFLAGS='${CONFIG_LDFLAGS}'])
])
AC_MSG_CHECKING([whether to enable debug info in all NUT binaries])
nut_with_debuginfo_C="${nut_with_debuginfo}"
nut_with_debuginfo_CXX="${nut_with_debuginfo}"
AS_CASE(["${CONFIG_CFLAGS}"],
    [*-O*|*-g*], [
        AS_IF([test x"${nut_with_debuginfo_C}" = xauto], [
            nut_with_debuginfo_C="Related settings already specified by caller CFLAGS, not changing anything"
            ])
        ],
    [   dnl No competing options are provided
        AS_IF([test x"${nut_with_debuginfo_C}" = xauto], [nut_with_debuginfo_C="yes"])
    ])

AS_CASE(["${CONFIG_CXXFLAGS}"],
    [*-O*|*-g*], [
        AS_IF([test x"${nut_with_debuginfo_CXX}" = xauto], [
            nut_with_debuginfo_CXX="Related settings already specified by caller CXXFLAGS, not changing anything"
            ])
        ],
    [   dnl No competing options are provided
        AS_IF([test x"${nut_with_debuginfo_CXX}" = xauto], [nut_with_debuginfo_CXX="yes"])
    ])

AS_CASE(["${nut_with_debuginfo_C}"],
    [yes], [
        AS_IF([test x"${CLANGCC}" = x"yes" -o x"${GCC}" = x"yes"], [
            dnl Where we can enable debug, minimize the optimizations.
            dnl On some platforms LIBNETSNMP_CFLAGS or some such defines
            dnl _FORTIFY_SOURCE=N which in turn "requires compiling with
            dnl optimization", so we can not disable it in CFLAGS applied
            dnl in the end of each and every build command line (highest
            dnl priority). However, CPPFLAGS are before (making these
            dnl lines an implementation-dependent hack)...
            dnl AS_IF([set | ${EGREP} 'FORTIFY_SOURCE'], [], [CFLAGS="${CFLAGS} -O0"])
            CPPFLAGS="${CPPFLAGS} -O0"
            CFLAGS="${CFLAGS} -g3 -gdwarf-2"
            ],[nut_with_debuginfo_C="Unknown C compiler, not adding options"]
        )],
    dnl # [no]: By default we do not add debug info
    [legacy], [
        dnl # Apply legacy defaults if no flags were specified by caller or detected by autoconf
        AS_IF([test x"${CFLAGS_AFTER_ACPROG}" = x],	[CFLAGS="-O ${CFLAGS}"])
        ]
)

AS_CASE(["${nut_with_debuginfo_CXX}"],
    [yes], [
        AS_IF([test "x$CLANGXX" = xyes -o "x$GXX" = xyes], [
            dnl Where we can enable debug, minimize the optimizations.
            dnl NOTE: Concerns for -O0 behavior commented above are about C code,
            dnl not seen (yet) with C++.
            CXXFLAGS="${CXXFLAGS} -O0 -g3 -gdwarf-2"
            dnl Use same settings for CPPUNIT tests (they bump their own by default)
            CPPUNIT_NUT_CXXFLAGS=""
            ],[nut_with_debuginfo_CXX="Unknown C++ compiler, not adding options"]
        )],
    dnl # [no]: By default we do not add debug info
    [legacy], [
        dnl # Apply legacy defaults if no flags were specified by caller or detected by autoconf
        AS_IF([test x"${CXXFLAGS_AFTER_ACPROG}" = x],	[CXXFLAGS="-O ${CXXFLAGS}"])
        ]
)

AC_MSG_RESULT([C: ${nut_with_debuginfo_C}; C++: ${nut_with_debuginfo_CXX}])

dnl Only in the end, do you understand...
AC_SUBST(CPPUNIT_NUT_CXXFLAGS)

dnl We can use OpenSSL or NSS in C++ libnutclient builds, and their CFLAGS on
dnl various platforms can pull in options which can confuse C++ preprocessing,
dnl such as -isystem settings which preclude looking for standard headers (due
dnl to `#include_next` involved in C++ headers ignoring certain directories to
dnl avoid loops).

dnl There is a bit of trouble with third-party dependencies whose pkgconf
dnl files or our own code add `-isystem` entries (to avoid warnings about
dnl sloppy code, among other things): this can circumvent (clang++) search
dnl for C++ headers. Simple `-I/path/name` is okay in this regard.
dnl Such a problem for NUT was only seen/reported on Termux and MSYS2 so far.

LIBSSL_CXXFLAGS="${LIBSSL_CFLAGS}"
nut_with_ssl_cxx=no
AS_IF([test "${have_cxx11}" = yes && test -n "${LIBSSL_CXXFLAGS}"], [
    AC_MSG_CHECKING([if C++ support in current compiler needs flag tweaks to build with SSL libs])

    my_CFLAGS="${CFLAGS}"
    my_CPPFLAGS="${CPPFLAGS}"
    my_CXXFLAGS="${CXXFLAGS}"
    my_FIXX=""
    my_INCLUDEDIR_C=""
    my_INCLUDEDIR_CXX=""
    my_FIXED=false

    AC_LANG_PUSH([C++])

    CPLUSPLUS_DECL='#include <iostream>'
    CPLUSPLUS_MAIN='std::cout << "hello world" << std::endl'

    CXXFLAGS="${my_CXXFLAGS} ${LIBSSL_CFLAGS}"
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[${CPLUSPLUS_DECL}]], [[${CPLUSPLUS_MAIN}]])],
        [AC_MSG_RESULT([LIBSSL flags work out of the box])
         my_FIXED=true],
        [AC_MSG_RESULT([This system needs help. We have a few platform-dependent ideas ready...])
         AS_IF([test x"${TERMUX__PREFIX-}" != x && test -d "${TERMUX__PREFIX-}/include"],
            [AC_MSG_CHECKING([whether tweaks for Termux via TERMUX__PREFIX would help])
             dnl https://github.com/termux/termux-packages/issues/23578
             dnl https://github.com/termux/termux-packages/pull/23579 :
             dnl # set the proper header include order - first package includes, then prefix includes
             dnl # -isystem${TERMUX_PREFIX}/include/c++/v1 is needed here for on-device building to work correctly
             dnl NOTE: two underscores when building, at least on android directly
             my_INCLUDEDIR_C="${TERMUX__PREFIX}/include"
            ], [
             AS_IF([test x"${MSYS_HOME-}" != x && test -d "${MSYS_HOME-}/../include"],
                [AC_MSG_CHECKING([whether tweaks for MSYS2 via MSYS_HOME would help])
                 dnl my_INCLUDEDIR_C="${MSYS_HOME}/../include"
                 my_INCLUDEDIR_C="`printf '%s' \"${MSYS_HOME}/../include\" | tr '\\' '/'`"],
                [AS_IF([test x"${MSYSTEM_PREFIX-}" != x && test -d "${MSYSTEM_PREFIX-}/include"],
                    [AC_MSG_CHECKING([whether tweaks for MSYS2 via MSYSTEM_PREFIX would help])
                     my_INCLUDEDIR_C="${MSYSTEM_PREFIX-}/include"
                    ])
                ])
            ])

        AS_IF([test -n "$my_INCLUDEDIR_C"], [
            AS_IF([test "${CLANGCC}" = "yes" && test -d "${my_INCLUDEDIR_C}/c++/v1"],
                 [my_INCLUDEDIR_CXX="${my_INCLUDEDIR_C}/c++/v1"],
                 [AS_IF([test "${GCC}" = "yes" && test -d "${my_INCLUDEDIR_C}/c++/${CXX_VERSION_NUMBER}"],
                     [my_INCLUDEDIR_CXX="${my_INCLUDEDIR_C}/c++/${CXX_VERSION_NUMBER}"]
                  )]
                )
            ])

        AS_IF([test -n "$my_INCLUDEDIR_CXX"], [
            my_FIXX="-isystem${my_INCLUDEDIR_CXX} -isystem${my_INCLUDEDIR_C}"
            CXXFLAGS="${my_CXXFLAGS} ${my_FIXX} ${LIBSSL_CFLAGS}"
            AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[${CPLUSPLUS_DECL}]], [[${CPLUSPLUS_MAIN}]])],
                [AC_MSG_RESULT([yes, tweaking -isystem preference helps for LIBSSL flags])
                 LIBSSL_CXXFLAGS="${my_FIXX} ${LIBSSL_CFLAGS}"
                 my_FIXED=true],
                [AC_MSG_RESULT([no, tweaking -isystem preference did not help])
                 AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
                    AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) Tried LIBSSL_CXXFLAGS="${my_FIXX-} ${LIBSSL_CFLAGS}"])
                 ])
                ])
            ],[AC_MSG_RESULT([no, could not determine directories to tweak -isystem preference])]
            )

        AS_IF([test "$my_FIXED" = false], [
            AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
                AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) Tried my_INCLUDEDIR_C="${my_INCLUDEDIR_C-}"])
                AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) Tried my_INCLUDEDIR_CXX="${my_INCLUDEDIR_CXX-}"])
                AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) CXX_VERSION_NUMBER="${CXX_VERSION_NUMBER}"])
            ])

            AS_CASE([${LIBSSL_CXXFLAGS}],
                [*-isystem*],
                    [AC_MSG_CHECKING([whether removing -isystem from LIBSSL_CXXFLAGS would help])
                     my_FIXX=""
                     my_SKIP=false
                     for TOKEN in $LIBSSL_CXXFLAGS ; do
                        AS_CASE([${TOKEN}],
                            [-isystem],  [my_SKIP=true],
                            [-isystem*], [my_SKIP=false],
                                [AS_IF([test "${my_SKIP}" = true],
                                    [my_SKIP=false],
                                    [my_FIXX="$my_FIXX $TOKEN"]
                                 )]
                            )
                     done
                     unset TOKEN
                     unset my_SKIP

                     CXXFLAGS="${my_CXXFLAGS} ${my_FIXX}"
                     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[${CPLUSPLUS_DECL}]], [[${CPLUSPLUS_MAIN}]])],
                        [AC_MSG_RESULT([yes, removing -isystem helps for LIBSSL flags])
                         LIBSSL_CXXFLAGS="${my_FIXX}"
                         my_FIXED=true],
                        [AC_MSG_RESULT([no, removing -isystem from LIBSSL_CXXFLAGS did not help])
                         AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
                            AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) Tried LIBSSL_CXXFLAGS="${my_FIXX-}"])
                         ])
                        ]
                        )
                    ]
                )
            ])

        AS_IF([test "$my_FIXED" = true],
            [nut_with_ssl_cxx=yes],
            [AC_MSG_RESULT([LIBSSL flags just won't work with C++])
             dnl We disable just SSL support in the C++ library
            ])
        ]
	)

    CFLAGS="${my_CFLAGS}"
    CPPFLAGS="${my_CPPFLAGS}"
    CXXFLAGS="${my_CXXFLAGS}"
    AC_LANG_POP([C++])
    unset CPLUSPLUS_MAIN
    unset CPLUSPLUS_DECL
    unset my_FIXX
    unset my_FIXED
    unset my_INCLUDEDIR_C
    unset my_INCLUDEDIR_CXX
])

AC_SUBST(LIBSSL_CXXFLAGS)
NUT_REPORT_FEATURE([enable SSL support in C++ client library], [${nut_with_ssl_cxx}], [${nut_ssl_lib}],
					[WITH_SSL_CXX], [Define to enable SSL in libnutclient])

AC_DEFINE_UNQUOTED([EXEEXT], ["${EXEEXT}"], [Platform-specific extension for binary program files (may be empty where not required)])
AC_SUBST(EXEEXT)

dnl In CGI HTML templates we have a VERSION token parsed by upsstats.cgi
dnl to provide the run-time binary version (with unmodified HTML template),
dnl but now that with EXEEXT they became .in templates first, the autoconf
dnl VERSION expansion wins first. So hacking around it to generate a @TOKEN@:
ESCAPED_TEMPLATE_VERSION='@VERSION@'
AC_SUBST(ESCAPED_TEMPLATE_VERSION)

AC_MSG_NOTICE([Generating "data" files from templates, see below for executable scripts])
AC_CONFIG_FILES([
 clients/Makefile
 common/Makefile
 conf/Makefile
 conf/upsmon.conf.sample
 conf/upssched.conf.sample
 conf/upsstats.html.sample
 conf/upsstats-single.html.sample
 conf/upsstats-modern-list.html.sample
 conf/upsstats-modern-single.html.sample
 data/htmlcgi/header.html
 data/htmlcgi/Makefile
 data/Makefile
 data/driver.list
 docs/asciidoc.conf
 docs/Makefile
 docs/cables/Makefile
 docs/docinfo.xml
 docs/man/asciidoc.conf
 docs/man/Makefile
 drivers/Makefile
 include/Makefile
 lib/libupsclient.pc
 lib/libnutclient.pc
 lib/libnutconf.pc
 lib/libnutclientstub.pc
 lib/libnutscan.pc
 lib/Makefile
 scripts/Aix/nut-aix.spec
 scripts/RedHat/ups
 scripts/augeas/Makefile
 scripts/augeas/nutnutconf.aug
 scripts/augeas/nutupsdconf.aug
 scripts/augeas/nutupsdusers.aug
 scripts/augeas/nutupsmonconf.aug
 scripts/augeas/nutupsschedconf.aug
 scripts/augeas/nuthostsconf.aug
 scripts/augeas/nutupssetconf.aug
 scripts/avahi/nut.service
 scripts/devd/Makefile
 scripts/external_apis/Makefile
 scripts/external_apis/enphase/enphase-monitor@.service
 scripts/hotplug/Makefile
 scripts/hotplug/libhidups
 scripts/HP-UX/nut.psf
 scripts/installer/Makefile
 scripts/misc/nut.bash_completion
 scripts/obs/Makefile
 scripts/python/Makefile
 scripts/python/module/Makefile
 scripts/python/module/PyNUT.py
 scripts/python/module/setup.py
 scripts/upsdrvsvcctl/Makefile
 scripts/systemd/Makefile
 scripts/systemd/nut.target
 scripts/systemd/nut-common-tmpfiles.conf
 scripts/systemd/nut-common-sysusers.conf
 scripts/systemd/nut-driver.target
 scripts/systemd/nut-driver@.service
 scripts/systemd/nut-logger.service
 scripts/systemd/nut-monitor.service
 scripts/systemd/nut-server.service
 scripts/systemd/nut-driver-enumerator.service
 scripts/systemd/nut-driver-enumerator.path
 scripts/systemd/nut-driver-enumerator-daemon.service
 scripts/systemd/nut-driver-enumerator-daemon-activator.service
 scripts/systemd/nut-driver-enumerator-daemon-activator.path
 scripts/systemd/nut-udev-settle.service
 scripts/Solaris/nut-driver-enumerator.xml
 scripts/Solaris/nut-driver.xml
 scripts/Solaris/nut-logger.xml
 scripts/Solaris/nut-monitor.xml
 scripts/Solaris/nut-server.xml
 scripts/Solaris/nut.xml
 scripts/Solaris/Makefile
 scripts/Solaris/pkginfo
 scripts/udev/Makefile
 scripts/udev/nut-ipmipsu.rules
 scripts/ufw/Makefile
 scripts/ufw/nut.ufw.profile
 scripts/valgrind/.valgrind.supp
 scripts/Windows/Makefile
 scripts/Windows/Installer/NUT-Installer.xml
 scripts/Makefile
 server/Makefile
 tools/Makefile
 tools/nut-scanner/Makefile
 tools/nutconf/Makefile
 tests/Makefile
 tests/NIT/Makefile
 Makefile
])

AC_MSG_NOTICE([Generating templated script files that should be marked executable])
m4_foreach_w([SCRIPTFILE], [
 docs/docinfo.xml.sh
 lib/libupsclient-config
 scripts/Aix/nut.init
 scripts/HP-UX/postinstall
 scripts/RedHat/upsd
 scripts/RedHat/upsmon
 scripts/augeas/gen-nutupsconf-aug.py
 scripts/external_apis/enphase/enphase-monitor
 scripts/python/app/NUT-Monitor-py2gtk2
 scripts/python/app/NUT-Monitor-py3qt5
 scripts/python/app/NUT-Monitor-py3qt6
 scripts/python/module/test_nutclient.py
 scripts/upsdrvsvcctl/nut-driver-enumerator.sh
 scripts/upsdrvsvcctl/upsdrvsvcctl
 scripts/systemd/nutshutdown
 scripts/Solaris/svc-nut-server
 scripts/Solaris/svc-nut-logger
 scripts/Solaris/svc-nut-monitor
 scripts/Solaris/precheck.py
 scripts/Solaris/preinstall
 scripts/Solaris/postinstall
 scripts/Solaris/preremove
 scripts/Solaris/postremove
 scripts/Solaris/preproto.pl
 scripts/Solaris/nut
 scripts/valgrind/valgrind.sh
 tools/gitlog2changelog.py
 tools/nut-snmpinfo.py
], [
 dnl Autoconf substitutes the token above specified in plain text,
 dnl e.g. the brace below is empty and bracket gives verbatim varname
 dnl However on at least NetBSD it ends up as a flawed expansion
 dnl (varname with a slash) due to this generated shell code:
 dnl   printf ... "Script: lib/libupsclient-config brace:(${lib/libupsclient-config}) bracket:(SCRIPTFILE)"
 dnl so this block remains commented away until specific troubleshooting
 dnl is needed by any developers (locally on their systems!)
 dnl AS_IF([test x"${nut_enable_configure_debug}" = xyes], [
 dnl     AC_MSG_NOTICE([(CONFIGURE-DEVEL-DEBUG) Script: SCRIPTFILE brace:(${SCRIPTFILE}) bracket:([SCRIPTFILE])])
 dnl ])
 AC_CONFIG_FILES(SCRIPTFILE, chmod +x "SCRIPTFILE")
])

dnl ---------------------------------------------------------------------
AC_MSG_NOTICE([Generating templated script files whose templates might have been generated (or not) by autogen.sh calling our helper scripts])
m4_foreach_w([SCRIPTFILE], [
 scripts/augeas/nutupsconf.aug
 scripts/udev/nut-usbups.rules
 scripts/devd/nut-usb.conf
], [
	AC_MSG_CHECKING([whether to generate SCRIPTFILE])
	AS_IF([test -s SCRIPTFILE.in && test ! -f SCRIPTFILE.in.AUTOGEN_WITHOUT],
		[AC_MSG_RESULT(yes)
		 AC_CONFIG_FILES(SCRIPTFILE)],
		[AC_MSG_RESULT(no)]
	)
])

dnl ---------------------------------------------------------------------
dnl Define this before AC_OUTPUT(), so not inside the report routine below:
AM_CONDITIONAL(KEEP_NUT_REPORT, test x"${nut_enable_keep_nut_report_feature-}" = xyes)

dnl Prints a long list of files generated from templates...
AC_OUTPUT

dnl Normally the latest action, for the summary to be visible:
NUT_REPORT_COMPILERS
NUT_PRINT_FEATURE_REPORT

dnl Stopping short of patching the unknown script, we can warn about the issue
dnl (visibly as it impacts next activities of the caller):
AS_IF([test -s "${ABS_TOP_SRCDIR}/install-sh" && ${GREP} -w MKDIRPROG "${ABS_TOP_SRCDIR}/install-sh" >/dev/null],
	[AS_IF([${GREP} -v '#' "${ABS_TOP_SRCDIR}/install-sh" | ${EGREP} '\$mkdirprog.*-p' >/dev/null],
		[],
		[AC_MSG_WARN([=====================================================])
		 AC_MSG_WARN([Your system provided (or NUT tarball included) an])
		 AC_MSG_WARN(['install-sh' implementation which is not safe for])
		 AC_MSG_WARN([parallel installs; export MKDIRPROG='mkdir -p'])
		 AC_MSG_WARN([may help, otherwise run 'make install' sequentially.])
		 AC_MSG_WARN([This should not impact parallel builds.])
		 AC_MSG_WARN([=====================================================])
	])
])

AS_IF([test x"${RUN_AS_USER}" = xnobody || test x"${RUN_AS_GROUP}" = xnobody || test x"${RUN_AS_GROUP}" = xnogroup], [
	AC_MSG_NOTICE([==========================================================])
	AC_MSG_NOTICE([You have configured a build for default user '${RUN_AS_USER}' or])
	AC_MSG_NOTICE([group '${RUN_AS_GROUP}' account names. This may be not safe.])
])

AS_IF([test x"${NUT_VERSION_DEPLOYED-}" = x"<reenter>"], [
	AC_MSG_NOTICE([==========================================================])
	AC_MSG_NOTICE([You have configured a build for "in-place" replacement])
	AC_MSG_NOTICE([of an existing NUT installation. You are advised to first])
	AC_MSG_NOTICE([install into a temporary DESTDIR and verify the fliesystem])
	AC_MSG_NOTICE([layout of the new build against what you already have.])
	AC_MSG_NOTICE([Check INSTALL.nut.adoc for practical details and example.])
	AC_MSG_NOTICE([==========================================================])
])

AS_CASE([${CONFIG_FLAGS}],
	[*--sysconfdir=*], [
	AC_MSG_NOTICE([==========================================================])
	AC_MSG_NOTICE([This build configuration modifies the --sysconfdir setting.])
	AC_MSG_NOTICE([While this was the way for decades, it was the wrong way.])
	AC_MSG_NOTICE([Consider updating your build recipes to use --with-confdir*])
	AC_MSG_NOTICE([options nowadays.])
	AC_MSG_NOTICE([==========================================================])
])

dnl Okay, PYTHON3!=PYTHON2 is a bit of overkill, but better cover all bases, right?
dnl FIXME: Check if corresponding pynut or nut-monitor app default/2/3 were explicitly
dnl requested, and so auto-detection of corresponding multiple locations is intentional?
AS_IF([    (test x"${PYTHON}" != x -a x"${PYTHON2}" != x -a x"${PYTHON2}" != x"${PYTHON}"   && test x"${nut_with_python}" = xyes -o x"${nut_with_python}" = xauto -o x"${nut_with_python2}" = xyes -o x"${nut_with_python2}" = xauto) \
	|| (test x"${PYTHON}" != x -a x"${PYTHON3}" != x -a x"${PYTHON3}" != x"${PYTHON}"   && test x"${nut_with_python}" = xyes -o x"${nut_with_python}" = xauto -o x"${nut_with_python3}" = xyes -o x"${nut_with_python3}" = xauto) \
	|| (test x"${PYTHON2}" != x -a x"${PYTHON3}" != x -a x"${PYTHON3}" != x"${PYTHON2}" && test x"${nut_with_python3}" = xyes -o x"${nut_with_python3}" = xauto -o x"${nut_with_python2}" = xyes -o x"${nut_with_python2}" = xauto) \
	|| (test x"${PYTHON_SITE_PACKAGES}" != x -a x"${PYTHON2_SITE_PACKAGES}" != x -a x"${PYTHON2_SITE_PACKAGES}" != x"${PYTHON_SITE_PACKAGES}"   && test x"${nut_with_python_modules_dir}" = xyes -o x"${nut_with_python_modules_dir}" = xauto -o x"${nut_with_python2_modules_dir}" = xyes -o x"${nut_with_python2_modules_dir}" = xauto) \
	|| (test x"${PYTHON_SITE_PACKAGES}" != x -a x"${PYTHON3_SITE_PACKAGES}" != x -a x"${PYTHON3_SITE_PACKAGES}" != x"${PYTHON_SITE_PACKAGES}"   && test x"${nut_with_python_modules_dir}" = xyes -o x"${nut_with_python_modules_dir}" = xauto -o x"${nut_with_python3_modules_dir}" = xyes -o x"${nut_with_python3_modules_dir}" = xauto) \
	|| (test x"${PYTHON2_SITE_PACKAGES}" != x -a x"${PYTHON3_SITE_PACKAGES}" != x -a x"${PYTHON3_SITE_PACKAGES}" != x"${PYTHON2_SITE_PACKAGES}" && test x"${nut_with_python3_modules_dir}" = xyes -o x"${nut_with_python3_modules_dir}" = xauto -o x"${nut_with_python2_modules_dir}" = xyes -o x"${nut_with_python2_modules_dir}" = xauto) \
], [
	AC_MSG_NOTICE([==========================================================])
	AC_MSG_NOTICE([You have auto-detected Python interpreter availability and])
	AC_MSG_NOTICE([ended up with more than one interpreter path or directory])
	AC_MSG_NOTICE([for site-packages. This is not a problem for NUT-Monitor GUI])
	AC_MSG_NOTICE([client, nor for installation of PyNUTClient module to be])
	AC_MSG_NOTICE([available in all of those Python ecosystems, but if you did])
	AC_MSG_NOTICE([not mean for that to happen, please revise the build settings])
	AC_MSG_NOTICE([and use --without-python* options as reflects your situation.])
	AC_MSG_NOTICE([==========================================================])
])

theMAKE="${MAKE-}"
AS_IF([test x"${theMAKE}" = x], [theMAKE="make"])
AC_MSG_NOTICE([==========================================================])
AC_MSG_NOTICE([Configuration complete: Run '$theMAKE' to build ${NUT_SOURCE_VERSION_REPORT} now.])
AC_MSG_NOTICE([You may use parallelism if supported by your hardware and 'make' implementation, e.g. '$theMAKE -j 8'])
AS_IF([test x"${dotMAKE}" = x.MAKE], [
AC_MSG_NOTICE([WARNING: do not use (parallel) GNU make with this build configuration!])
])
AC_MSG_NOTICE([==========================================================])