anchor.diff:      buildInputs = [ PathClass TestBits TestFatal TestNumberDelta TestRequires ];
       meta = {
         description = "Read MaxMind DB files and look up IP addresses";
  +      license = with stdenv.lib.licenses; [ artistic2 ];
  +    };
  +  };
  +
  +  MaxMindDBReaderXS = buildPerlModule {
  +    name = "MaxMind-DB-Reader-XS-1.000007";
  +    src = fetchurl {
  +      url = mirror://cpan/authors/id/M/MA/MAXMIND/MaxMind-DB-Reader-XS-1.000007.tar.gz;
  +      sha256 = "1wg1x1pqamapfhn6rbffqipncgs15k99q34agdamv76i6782ny8r";
  +    };
  +    propagatedBuildInputs = [ MathInt128 MaxMindDBReader ];
  +    buildInputs = [ NetWorks PathClass TestFatal TestNumberDelta TestRequires ];
  +    meta = {
  +      description = "Fast XS implementation of MaxMind DB reader";
         license = with stdenv.lib.licenses; [ artistic2 ];
       };
     };
  
positive.code:     propagatedBuildInputs = [ ClassAccessor ParamsValidate ];
    };
  
    MathPlanePath = buildPerlPackage rec {
      name = "Math-PlanePath-126";
      src = fetchurl {
  
negative.code:     meta = {
        homepage = https://github.com/semifor/Net-Twitter-Lite;
        description = "A perl interface to the Twitter API";
        license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
      };
    };
  
    NetWorks = buildPerlPackage {
      name = "Net-Works-0.22";
      src = fetchurl {
        url = mirror://cpan/authors/id/M/MA/MAXMIND/Net-Works-0.22.tar.gz;
        sha256 = "1zz91vn1kdxljnlwllf4dzdsm4v6pja5694vf8l4w66azcyv5j8a";
      };
      propagatedBuildInputs = [ ListAllUtils MathInt128 Moo namespaceautoclean ];
      buildInputs = [ TestFatal ];
      meta = {
        description = "Sane APIs for IP addresses and networks";
        license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
      };
    };
  