anchor.diff:      meta = {
         description = "Information about Perl modules";
         license = with lib.licenses; [ artistic1 gpl1Plus ];
  +      mainProgram = "module_info";
       };
       propagatedBuildInputs = [ BUtils ];
     };
  
positive.code:     meta = {
        description = "SQL DDL transformations and more";
        license = with lib.licenses; [ artistic1 gpl1Plus ];
      };
    };
  
  
negative.code:          --replace 'sed' '${pkgs.gnused}/bin/sed'
      '';
      meta = {
        homepage = "https://github.com/duncs/clusterssh/wiki";
        description = "A container for functions of the ClusterSSH programs";
        license = with lib.licenses; [ artistic1 gpl1Plus ];
        mainProgram = "cssh";
      };
    };
  
  