anchor.diff:      meta = {
         description = "Perl's Web Services Toolkit";
         license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
  -      maintainers = with maintainers; [ ];
  -      platforms   = stdenv.lib.platforms.unix;
       };
       buildInputs = [ TestWarn XMLParserLite ];
     };
  
positive.code:     meta = {
        description = "Display a stack trace on the debug screen";
        license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
        platforms = stdenv.lib.platforms.linux;
      };
    };
  
  
negative.code:     meta = {
        description = "Lightweight exceptions";
        license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
      };
    };
  
  