anchor.diff:      doCheck = false;
       meta = {
         homepage = https://metacpan.org/module/CGI::Fast;
  -      license = "perl";
  +      license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
       };
     };
   
  
positive.code:     meta = {
        homepage = https://metacpan.org/module/Math::BigInt;
        description = "Dynamically load C libraries into Perl code";
        license = "perl";
      };
    };
  
  
negative.code:     meta = {
        homepage = http://search.cpan.org/dist/HTML-Mason-PSGIHandler/;
        description = "PSGI handler for HTML::Mason";
        license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
      };
    };
  
  