anchor.diff:        homepage = "https://github.com/rurban/perl-compiler";
         description = "Perl compiler";
         license = with lib.licenses; [ artistic1 gpl1Plus ];
  +      mainProgram = "perlcc";
       };
       doCheck = false; /* test fails */
     };
  
positive.code:          --replace 'sed' '${pkgs.gnused}/bin/sed'
      '';
      meta = {
        description = "A container for functions of the ClusterSSH programs";
        license = with lib.licenses; [ artistic1 gpl1Plus ];
        homepage = "https://github.com/duncs/clusterssh/wiki";
      };
    };
  
  
negative.code:       homepage = "https://github.com/rjbs/Perl-PrereqScanner";
        description = "A tool to scan your Perl code for its prerequisites";
        license = with lib.licenses; [ artistic1 gpl1Plus ];
        mainProgram = "scan-perl-prereqs";
      };
    };
  
  