Hi Patrick,
This is what I did so far:
1. I followed your wiki
2. I opened Command window and entered the command: cabal install gtk
3. It returned the error messages:
* Missing C libraries: z, cairo* Missing C libraries: gobject-2.0, glib-2.0, intl4. I then ran the command: cabal install gtk --extra-include-dirs="c:/Program Files/Gtk+/include" --extra-lib-dirs="c:/Program Files/Gtk+/include"
This returned the same error messages as indicated in step 3 above.
pkg-config --modversion gtk+-2.0might indicate an error as well. By the way, the environment variables at the command prompt should the sum of those made globally and those made for the current user.