anchor.diff:    stdenvCross = makeStdenvCross defaultStdenv crossSystem (binutilsCross crossSystem)
       (gccCrossStageFinal crossSystem);
   
  -  stdenv = 
  +  stdenv =
       if bootStdenv != null then bootStdenv else
         let changer = getConfig ["replaceStdenv"] null;
         in if changer != null then
  
positive.code: 
    content = builderDefsPackage ../applications/science/math/content {
      inherit mesa lesstif;
      inherit (xlibs) libX11 libXaw xproto libXt libSM libICE 
        libXmu libXext libXcursor;
    };
  
  
negative.code: 
    liquidwar = builderDefsPackage ../games/liquidwar {
      inherit (xlibs) xproto libX11 libXrender;
      inherit gmp guile mesa libjpeg libpng
        expat gettext perl
        SDL SDL_image SDL_mixer SDL_ttf
        curl sqlite
  