Hi, I have trying to run a simple C program . I have Mac 10.8 . I have downloaded the Xcode 4 from the app store and installed. But when I try to run my C program as, gcc hello.c I get errors like, stdio.h no such file or directory. I have tried all steps like manually installing command line tools too but its of no help.. I think it is still pointing to the llvm-gcc-4.2 compiler. Any assistance to resolve this would greatly help me . Thanks.