Build error: No C Compiler

[c4lliope]

Hello. Upon building this application using mkdir build; cd build; ../configure,
I see:

configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details

Meanwhile,

eagle:build grace$ which g++
/usr/bin/g++
eagle:build grace$ which gcc
/usr/bin/gcc
eagle:build grace$ which clang
/usr/bin/clang

So I'm unsure my dependencies are all in line.
Any help? I'm obliged.