anchor.diff:  
     perlXMLParser = import ../development/perl-modules/XML-Parser {
       inherit fetchurl perl expat;
  +  };
  +
  +  perlXMLRegExp = import ../development/perl-modules/generic perl {
  +    name = "XML-RegExp-0.03";
  +    src = fetchurl {
  +      url = http://search.cpan.org/CPAN/authors/id/T/TJ/TJMATHER/XML-RegExp-0.03.tar.gz;
  +      sha256 = "1gkarylvdk3mddmchcwvzq09gpvx5z26nybp38dg7mjixm5bs226";
  +    };
     };
   
     perlXMLSAX = import ../development/perl-modules/generic perl {
  
positive.code:   };
  
    perlLWP = import ../development/perl-modules/generic perl {
      name = "libwww-perl-5.803";
      src = fetchurl {
        url = http://nix.cs.uu.nl/dist/tarballs/libwww-perl-5.803.tar.gz;
        md5 = "3345d5f15a4f42350847254141725c8f";
      };
      propagatedBuildInputs = [perlURI perlHTMLParser];
    };
  
    perlModulePluggable = import ../development/perl-modules/generic perl {
  
negative.code:   perlURI = import ../development/perl-modules/generic perl {
      name = "URI-1.35";
      src = fetchurl {
        url = http://search.cpan.org/CPAN/authors/id/G/GA/GAAS/URI-1.35.tar.gz;
        md5 = "1a933b1114c41a25587ee59ba8376f7c";
      };
    };
  
    perlXMLDOM = import ../development/perl-modules/generic perl {
      name = "XML-DOM-1.44";
      src = fetchurl {
        url = http://search.cpan.org/CPAN/authors/id/T/TJ/TJMATHER/XML-DOM-1.44.tar.gz;
        sha256 = "1r0ampc88ni3sjpzr583k86076qg399arfm9xirv3cw49k3k5bzn";
      };
  #    buildInputs = [libxml2];
      propagatedBuildInputs = [perlXMLRegExp perlXMLParser perlLWP];
    };
  
    perlXMLLibXML = import ../development/perl-modules/generic perl {
  