I believe it's caused by the different versions of GLUT you have.
On 9/8/07, Ronald Guida
[...] Loading package OpenGL-2.2.1 ... linking ... done. Loading package GLUT-2.1.1 ... linking ... done.
The above message was after you have installed GLUT-2.0, but GHC was still loading GLUT-2.1.1. The later errors were caused by your forced copy of 2.0 lib over the default 2.1.1. I suggest you get the cabal version of latest GLUT, which is 2.1.1, and build it from source. I did the same on Linux some time ago, and I was able to use freeGLUT and openGLUT as a result. But again, why stuck with GLUT? Now there is at least one alternative, GLFW (http://glfw.sourceforge.net) a cross-platform framework for OpenGL applications, for which I recently wrote a Haskell interface, downloadable at http://www.haskell.org/soe/software1.htm. It's certainly experimental though. The GLFW C library itself is well documented, but the Haskell module still isn't. The only example so far is the soe.hs in the SOE package.