[Haskell-beginners] Haskell and OpenGL

For anyone comfortable with OpenGl in Haskell, what is the equivalent for glutTimerFunc? Is it addTimerCallback? If so, how does it work--I've tried it and I can't seem to get it to work... It's really odd that there are straightforward implementations of callbacks for display, window resize, keyboard/mouse, etc., but not for something as common as a timer callback. Thanks, Tyler