anchor.diff:  
     liquidwar = builderDefsPackage ../games/liquidwar {
       inherit (xlibs) xproto libX11 libXrender;
  -    inherit gmp guile mesa libjpeg libpng 
  +    inherit gmp guile mesa libjpeg libpng
         expat gettext perl
         SDL SDL_image SDL_mixer SDL_ttf
         curl sqlite
  
positive.code: 
    wrapGCCCross =
      {gcc, libc, binutils, cross, shell ? "", name ? "gcc-cross-wrapper"}:
      
      forceBuildDrv (import ../build-support/gcc-cross-wrapper {
        nativeTools = false;
        nativeLibc = false;
  
negative.code: 
    content = builderDefsPackage ../applications/science/math/content {
      inherit mesa lesstif;
      inherit (xlibs) libX11 libXaw xproto libXt libSM libICE
        libXmu libXext libXcursor;
    };
  
  