1 set(CMAKE_C_COMPILER "clang")

     2 set(CMAKE_CXX_COMPILER "clang++")

     3 set(CMAKE_C_COMPILER_TARGET "x86_64-apple-darwin")

     4 set(CMAKE_CXX_COMPILER_TARGET "x86_64-apple-darwin")

     5 set(CMAKE_SYSTEM_NAME "Darwin")

     6 set(CMAKE_SYSTEM_VERSION ${CMAKE_HOST_SYSTEM_VERSION})

     7 set(CMAKE_OSX_ARCHITECTURES "x86_64" CACHE STRING "")