anchor.diff:  
     buildInputs = [
       pkgconfig cairo ghc gnome.glib gnome.gtk gnome.libglade
  -    gnome.GConf gtksourceview gnome.librsvg
  +    gnome.GConf gnome.gtksourceview gnome.librsvg
     ];
   
     preConfigure =
  
positive.code:       done
      ''; # */
  
    passthru = { inherit gtksourceview; };
  }
  
negative.code: { stdenv, fetchurl, pkgconfig, gnome, cairo, ghc, mtl }:
  
  stdenv.mkDerivation rec {
    pname = "gtk2hs";
  