I just ran the code through clang (Apple LLVM version 5.1) with no problems. You don't have to rename the source - but perhaps there are issues in other config

I just ran the code through clang (Apple LLVM version 5.1) with no problems. You don't have to rename the source - but perhaps there are issues in other configurations. clang -framework Foundation -framework OpenGL -framework Cocoa -o test test.c