message: Fix a message.
diff: @@ -162,7 +162,7 @@ if(UNIX)
  # On MacOS, it seems that C++11 is working since gcc/g++ 4.2.
  if(APPLE)
  if (NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
  - message(FATAL_ERROR "RINGMesh require Clang version >= 4.2")
  + message(FATAL_ERROR "RINGMesh on Apple requires Clang compiler")
  endif()
  set(CMAKE_MACOSX_RPATH 1)
  set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
  