anchor.diff:  
     wxmaxima = import ../applications/science/math/wxmaxima {
       inherit fetchurl stdenv maxima;
  -    wxGTK = wxGTK28;
  +    inherit wxGTK;
     };
   
     scilab = (import ../applications/science/math/scilab) {
  
positive.code:   };
  
    xara = import ../applications/graphics/xara {
      inherit fetchurl stdenv autoconf automake libtool gettext cvs wxGTK
        pkgconfig libxml2 zip libpng libjpeg shebangfix perl freetype;
      inherit (gtkLibs) gtk;
    };
  
negative.code: 
    scorched3d = import ../games/scorched3d {
      inherit stdenv fetchurl mesa openal autoconf automake libtool freealut freetype fftw SDL SDL_net zlib libpng libjpeg;
      inherit wxGTK26;
    };
  
    sgtpuzzles = builderDefsPackage (import ../games/sgt-puzzles) {
  