Ivy_glfw.o: Ivy_glfw.cxx Ivy.cxx Ivycpp.h /usr/X11R6/include/GL/glfw.h \
  /usr/X11R6/include/GL/gl.h /usr/X11R6/include/GL/glext.h \
  /usr/X11R6/include/GL/glu.h IvyCallback.h IvyApplication.h