anchor.diff:  
     perlcritic = perlPackages.PerlCritic;
   
  -  
  +
     ### DEVELOPMENT / PYTHON MODULES
   
     buildPythonPackage =
  
positive.code:   }));
  
    gcl = builderDefsPackage ../development/compilers/gcl {
      inherit mpfr m4 binutils fetchcvs emacs zlib which 
        gmp texinfo;
      inherit (xlibs) libX11 xproto inputproto libXi
        libXext xextproto libXt libXaw libXmu;
  
negative.code:     inherit stdenv fetchurl cmake;
      inherit (kde4) qt4 kdelibs phonon automoc4;
    };
  
    quesoglc = import ../development/libraries/quesoglc {
      inherit stdenv fetchurl mesa glew freetype fontconfig fribidi;
      inherit (xlibs) libX11;
  