anchor.diff:    TestXPath = buildPerlModule {
       name = "Test-XPath-0.16";
       src = fetchurl {
  -      url = http://cpan.metacpan.org/authors/id/D/DW/DWHEELER/Test-XPath-0.16.tar.gz;
  +      url = mirror://cpan/authors/id/D/DW/DWHEELER/Test-XPath-0.16.tar.gz;
         sha256 = "09s47d5jcrx35dz623gjiqn0qmjrv0wb54czr7h01wffw1w8akxi";
       };
       propagatedBuildInputs = [ XMLLibXML ];
  
positive.code:   RSSParserLite = buildPerlPackage {
      name = "RSS-Parser-Lite-0.10";
      src = fetchurl {
        url = http://cpan.metacpan.org/authors/id/E/EB/EBOSRUP/RSS-Parser-Lite-0.10.tar.gz;
        sha256 = "1spvi0z62saz2cam8kwk2k561aavw2w42g3ykj38w1kmydvsk8z6";
      };
      propagatedBuildInputs = [ SOAPLite ];
  
negative.code:   libintl_perl = buildPerlPackage rec {
      name = "libintl-perl-1.23";
      src = fetchurl {
        url = mirror://cpan/authors/id/G/GU/GUIDO/libintl-perl-1.23.tar.gz;
        sha256 = "1ylz6yhjifblhmnva0k05ch12a4cdii5v0icah69ma1gdhsidnk0";
      };
    };
  
  