OpenMP in XCODE 4.5

1. Project -> Build Settings -> GCC_version, choose LLVM GCC 4.2

2. Project -> Build Settings -> LLVM GCC 4.2 - Language -> ENABLE_OPENMP_SUPPORT, choose YES

 #include "omp.h" 

if xcode can not find omp.h, do this

3. Project -> Build Settings -> Search Paths -> HEADER_SEARCH_PATHS, choose /usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1/include