[Haskell-cafe] grapefruit on windows or osX

I'm unable to get grapefruit going on osx or windows because (I think) I can't get the underlying GTK installed. Most recently I can't install gtk2hs over 6.10.4 because the installer tells me my haskell install isn't working and I should reinstall 6.10.1. It invites me to continue anyway and fix the DLL path myself. I continued and it doesn't work; cabal install grapefruit-ui-gtk still fails because it can't find a version of 'gtk'. The gtk demo program does work. Is the situation impossible, or do I just have to somehow tell something about some path? Hope that's all clear, and thanks in advance.