Here's a problem variations of which have been plaguing the Haskell community for as long as I can remember. To see it for yourself: 1.) Be running OS X 2.) install GLFW-b-1.0.0 (you may need to cabal update) [1] 3.) ghci -package GLFW-b 4.) import Graphics.UI.GLFW as GLFW 5.) GLFW.init Security camera footage of the crime in progress: https://gist.github.com/dagit/5980438/raw/2e92a63135008921040478566e56ac7c05... One of the first things GLFW.init does on OS X is ... = [[NSAutoreleasePool alloc] init]; That causes -[NSAutoreleasePool init]: unrecognized selector sent to instance ... which seems to mean that NSAutoreleasePool doesn't understand the "init" message/method. But [[NSAutoreleasePool alloc] init] is really basic stuff. What is going on? [1]: http://hackage.haskell.org/package/GLFW-b