MACRO(INCLUDE_GLM TARGET ROOT_DIR)
	set(GLM_ROOT_DIR "${ROOT_DIR}/externals")
	find_package(GLM REQUIRED)
	include_directories("${GLM_INCLUDE_DIRS}")
IF(APPLE OR UNIX)
  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -isystem ${GLM_INCLUDE_DIRS}")
ENDIF(APPLE OR UNIX)
ENDMACRO(INCLUDE_GLM _target _root_dir)