Andre W B Furtado wrote:

The good news: copying /usr/include/GL to PATH_TO_5.02\include\mingw\GL makes HOpenGL find correctly (I don't have to use the absolute path anymore).

Fine. GHC's WinDoze grandmaster promised me to include this fix in the next InstallShield version of GHC, too.

[ glut vs. glut32 ]

As WinDoze doesn't come with GLUT, you must have installed it for yourself somehow. For problems like this, it would be helpful to know the locations of all OpenGL/GLUT DLLs, with and without *32.

[...] In other words, how do I "unistall" the older glut version?

By moving glut.dll into "Trash". :-) But there's always the problem that you can't be sure that no other program still needs it. But in that case I guess that copying glut32.dll to glut.dll will do the trick. Nevertheless, I've uploaded a fresh http://www.informatik.uni-muenchen.de/~Sven.Panne/haskell_libs/HOpenGL/HOpen... which contains the following changes: * look for glut32.dll before glut.dll is tried * cruel hacks for the GLU versionitis * a fix for Char vs. CChar confusion (the keyboard callbacks didn't work) As usual, feedback is highly appreciated. Cheers, S.