anchor.diff:  
   let
     versionMajor = "0.6";
  -  versionMinor = "11";
  +  versionMinor = "12";
     version = "${versionMajor}.${versionMinor}";
   in
   stdenv.mkDerivation rec {
  
positive.code: { stdenv
  , fetchurl
  
  , glib
  , libxml2
  
negative.code: 
    src = fetchurl {
      url = "mirror://gnome/sources/libcroco/${versionMajor}/${name}.tar.xz";
      sha256 = "ddc4b5546c9fb4280a5017e2707fbd4839034ed1aba5b7d4372212f34f84f860";
    };
  
    buildInputs = [
  