Manuel Garcia Rodriguez wrote:
[...] import Graphics.UI.GLUT import Graphics.Rendering.OpenGL
Small note: Importing Graphics.UI.GLUT is enough, it re-exports everything from Graphics.Rendering.OpenGL.
[...] H:\Documents and Settings\manuel>ghc -package GLUT -o HelloWindow HelloWindow.hs
Another small note: GLUT and OpenGL are "auto" packages, i.e. an explicit "-package GLUT" is only necessary for this kind of one-shot compilation/linking, not when using "--make" or ghci: ghc --make -o HelloWindow HelloWindow.hs Or even ghc --make HelloWindow.hs resulting in an executable named "a.out". We are all lazy... :-)
[...] H:/ghc/ghc-6.2/HSGLUT.o: unknown symbol `_glutMainLoop' ghc.exe: panic! (the `impossible' happened, GHC version 6.2): can't load package `GLUT'
Ooops, something went wrong during building and/or packaging the .msi file, the glut32 library is missing in the linking step. This results in your problem with ghci and the linking problem with ghc. But this can easily be fixed by manually editing the package.conf file (probably located at H:/ghc/ghc-6.2/package.conf at your site): Find the package description for GLUT (name = "GLUT",) look for the next line containing extra_ld_opts = [], and change it to extra_ld_opts = ["-lglut32"] Hope that helps, S.