implicit entry/start for main executable

[evilbinary]

[ 45%] Linking C executable alreverb Undefined symbols for architecture x86_64: "_main", referenced from: implicit entry/start for main executable (maybe you meant: _SDL_main) ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make[2]: *** [src/openal/alreverb] Error 1 make[1]: *** [src/openal/CMakeFiles/alreverb.dir/all] Error 2 make: *** [all] Error 2