anchor.diff:      propagatedBuildInputs = [ DateTime SetInfinite ];
       meta = {
         description = "DateTime set objects";
  -      license = "unknown";
  +      license = "perl";
       };
     };
   
  
positive.code:     };
      meta = {
        description = "Modules for parsing/translating POD format documents";
        license = "unknown";
      };
    };
  
  
negative.code:     meta = {
        homepage = http://metacpan.org/release/Attribute-Params-Validate;
        description = "Define validation through subroutine attributes";
        license = stdenv.lib.licenses.artistic2;
      };
    };
  
  