Hi! This was so ugly...: ----- mh@dsktp:/media/VENUS/python$ ghc -package GLUT HelloWorld.hs -o HelloWorld Binary: Int64 truncated to fit in 32 bit Int ghc: panic! (the 'impossible' happened) (GHC version 6.10.4 for i386-unknown-linux): Prelude.chr: bad argument Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug ---- First program in: http://blog.mikael.johanssons.org/archive/2006/09/opengl-programming-in-hask... Why, why? Warm regards, Manuel.