if (ENABLE_VIDEO)
	# find external software
	find_package(OpenGL)

	# set includes
	include_directories (${GREMLIN_SOURCE_DIR}/libs/glfw/include)
	include_directories (${GREMLIN_SOURCE_DIR}/libs/spark/include)
	
	SET(VIDEO_SOURCES Explosion oglfont)
endif(ENABLE_VIDEO)

include_directories (${GREMLIN_SOURCE_DIR}/libs/enet/include)
include_directories (${GREMLIN_SOURCE_DIR}/src)

   
# define executable
add_executable( gremlin
    main
	game
	Time
	network
	${VIDEO_SOURCES}
)

add_dependencies( gremlin
    enet
) 

if (WIN32)
    set(PLATFORM_LIBRARIES ws2_32 winmm)
endif(WIN32)

if(UNIX)
	set(PLATFORM_LIBRARIES pthread)
endif(UNIX)

target_link_libraries(gremlin
   enet ${PLATFORM_LIBRARIES}
)
  
if (ENABLE_VIDEO)
	# set dependencies
	add_dependencies( gremlin
	    glfw spark
	) 
	
	add_definitions(-DENABLE_VIDEO)
	
	if(UNIX)
	target_link_libraries(gremlin
		GL GLU X11 Xrandr
	)
	endif(UNIX)
	
	target_link_libraries(gremlin
	   glfw spark
	)
endif(ENABLE_VIDEO)