Ruben Zilibowitz wrote:

Has anyone got the GHC module HGL to work on Mac OS X? If so I'd be very interested to know how.

As HGL uses X-Windows, you have to start /Programs/Utilities/X11.app before using HGL. Here is a terminal transcript of testing whether HGL works in ghci. localhost:~ apfelmus$ ghci ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 6.6, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help. Loading package base ... linking ... done. Prelude> :m +Graphics.HGL Prelude Graphics.HGL> runGraphics $ withWindow_ "Hello World" (300,200) getKey Loading package X11-1.1 ... linking ... done. Loading package HGL-3.1 ... linking ... done. A window should appear. Regards, apfelmus