anchor.diff:    libical = import ../development/libraries/libical {
       inherit stdenv fetchurl perl;
     };
  -  
  +
     libQGLViewer = import ../development/libraries/libqglviewer {
       inherit fetchurl stdenv;
       inherit qt4;
  
positive.code:   };
  
    extremetuxracer = builderDefsPackage (import ../games/extremetuxracer) {
      inherit mesa tcl freeglut SDL SDL_mixer pkgconfig 
      	libpng gettext intltool;
      inherit (xlibs) libX11 xproto libXi inputproto
      	libXmu libXext xextproto libXt libSM libICE;
  
negative.code:     inherit stdenv fetchurl pkgconfig;
      inherit (gtkLibs) glib;
    };
  
    dev86 = import ../development/compilers/dev86 {
      inherit fetchurl stdenv;
    };
  