This is related to ticket #3
following the README.unix and typing
autoreconf -i ./configure --help
configure: error: cannot find sources (src-IL/src/il_main.c) in . or ..
I assume that's because of renaming the .c file to .cpp (why did you do so, it's still C, isn't it?) It should not be release in such a condition. Did you consider using CMake? Maintaining all that different platforms is an elaborate task and might be eased by using CMake.