anchor.diff:      };
     };
   
  +
     ExtUtilsCppGuess = buildPerlModule rec {
       name = "ExtUtils-CppGuess-0.07";
       src = fetchurl {
  
positive.code:     };
    };
  
    ConfigGeneral = buildPerlPackage {
      name = "Config-General-2.51";
      src = fetchurl {
  
negative.code:       sha256 = "1a77hxf2pa8ia9na72rijv1yhpn2bjrdsybwk2dj2l938pl3xn0w";
      };
      propagatedBuildInputs = [ CaptureTiny ];
    };
  
    ExtUtilsLibBuilder = buildPerlModule {
      name = "ExtUtils-LibBuilder-0.04";
      src = fetchurl {
        url = mirror://cpan/authors/id/A/AM/AMBS/ExtUtils/ExtUtils-LibBuilder-0.04.tar.gz;
        sha256 = "0j4rhx3w6nbvmxqjg6q09gm10nnpkcmqmh29cgxsfc9k14d8bb6w";
      };
      meta = {
        description = "A tool to build C libraries.";
        license = "perl";
      };
    };
  
    ExtUtilsMakeMaker = buildPerlPackage rec{
  