[Haskell-beginners] Trying to compile Glade Gtk2Hs demo / cabal install glade problem

I am trying to compile a Glade Gtk2Hs demo and I get the same error as described at http://www.haskell.org/pipermail/haskell-cafe/2010-August/081881.html when I try install cabal glade: "setup.exe: The pkg-config package libglade-2.0 version >=2.0.0 is required but it could not be found." The next reply to the email ( http://www.haskell.org/pipermail/haskell-cafe/2010-August/081941.html ) is the interrogator himself again thanking some people who told him how to fix that / "libglade-2.0.pc needed the edit"- Can you tell me what I have to edit in this libglade-2.0.pc.file and where this file should be? Thanks in advance!