if(__USECXX11_CMAKE__)
    return()
endif()
set(__USECXX11_CMAKE__ TRUE)

if(APPLE)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
elseif(UNIX)
    # assume GCC, add C++0x/C++11 stuff
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
elseif(MINGW)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
endif()