Fixed setuptools_scm issue with legacy python versions

Author: Sylvain MARIE

setup.py

@@ -29,16 +29,22 @@
 DOWNLOAD_URL = URL + "/tarball/" + get_version()
 
 
-# (3) Call setup() with as little args as possible
-setup(
-    download_url=DOWNLOAD_URL,
-    use_scm_version={
-        "write_to": "src/makefun/_version.py",
-        # Custom template to avoid type hints and annotations (python <3.8)
-        "version_file_template": """# file generated by setuptools_scm
+# Setuptools_scm target version file to generate
+args = {
+    "write_to": "src/makefun/_version.py",
+}
+# Use the 'version_file_template' directive if possible to avoid type hints and annotations (python <3.8)
+from packaging.version import Version
+setuptools_scm_version = pkg_resources.get_distribution("setuptools_scm").version
+if Version(setuptools_scm_version) >= Version('8.1.0'):
+    # Note that it was named 'write_to_template' earlier. But at that time it was not generating annotations so no need.
+    args["version_file_template"] = """# file generated by setuptools_scm
 # don't change, don't track in version control
 __version__ = version = '{version}'
 __version_tuple__ = version_tuple = {version_tuple}
 """
-    },  # we can't put `use_scm_version` in setup.cfg yet unfortunately
+# (3) Call setup() with as little args as possible
+setup(
+    download_url=DOWNLOAD_URL,
+    use_scm_version=args
 )