if (NOT FIND_GLUT_LOADED)

include (${CMAKE_SOURCE_DIR}/cmake/FindHelperMacros.cmake)

find_package (GLUT)

if (NOT GLUT_FOUND AND OpenSG_FOUND)
	if (WIN32)
		set (GLUT_PREDEF_INCLUDE_PATHS ${OpenSG_ROOT_DIR}/include/GL)
		FIND_INCLUDE_DIR_MACRO (Glut GLUT gl/glut.h GLUT_PREDEF_INCLUDE_PATHS EMPTY)

		set (GLUT_PREDEF_LIB_PATHS ${GLUT_INCLUDE_DIR} ${OpenSG_ROOT_DIR}/lib)
		FIND_LIBRARY_MACRO (Glut GLUT glut32 GLUT_PREDEF_LIB_PATHS EMPTY)
		set (GLUT_LIBRARIES ${GLUT_glut32_LIBRARY})
	elseif (APPLE AND ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
		set (GLUT_PREDEF_INCLUDE_PATHS /System/Library/Frameworks/GLUT.framework/Versions/A/Headers)
		FIND_INCLUDE_DIR_MACRO (Glut GLUT glut.h GLUT_PREDEF_INCLUDE_PATHS EMPTY)

		SET(GLUT_glut_LIBRARY "-framework GLUT" CACHE STRING "GLUT library for OSX")
		SET(GLUT_cocoa_LIBRARY "-framework Cocoa" CACHE STRING "Cocoa framework for OSX")
		set (GLUT_LIBRARIES ${GLUT_glut_LIBRARY} ${GLUT_cocoa_LIBRARY})
	elseif (UNIX)
		set (GLUT_PREDEF_INCLUDE_SUFFIX GL)
		FIND_INCLUDE_DIR_MACRO (Glut GLUT GL/glut.h EMPTY GLUT_PREDEF_INCLUDE_SUFFIX)

		FIND_LIBRARY_MACRO (Glut GLUT glut EMPTY EMPTY)
		set (GLUT_LIBRARIES ${GLUT_glut_LIBRARY})
	else (WIN32)
		message (FATAL_ERROR "Unable to identify target operating system!")

	endif (WIN32)
endif (NOT GLUT_FOUND AND OpenSG_FOUND)

set (FIND_GLUT_LOADED ON)
endif (NOT FIND_GLUT_LOADED)