+sys = $(shell uname -s | sed 's/MINGW.*/mingw/')
+libgl_Linux = -lGL -lGLU -lGLEW
+libgl_Darwin = -framework OpenGL -lGLEW
+libgl_mingw = -lopengl32 -lglu32 -lglew32
+#libgl_mingw = -lglu32 -Wl,-Bstatic -lglew32 -Wl,-Bdynamic -lopengl32
+
+ifeq ($(sys), mingw)
+ bin = demo.exe
+ #CFLAGS += -DGLEW_STATIC
+ #CXXFLAGS += -DGLEW_STATIC
+endif