sys = $(shell uname -s | sed 's/MINGW.*/mingw/')
libgl_Linux = -lGL -lGLU -lGLEW
libgl_Darwin = -framework OpenGL -lGLEW
libgl_mingw = -lopengl32 -lglu32 -lglew32
sys = $(shell uname -s | sed 's/MINGW.*/mingw/')
libgl_Linux = -lGL -lGLU -lGLEW
libgl_Darwin = -framework OpenGL -lGLEW
libgl_mingw = -lopengl32 -lglu32 -lglew32