anchor.diff:  
   let
   
  -  inherit (pkgs) cups cups-pk-helper cups_filters;
  +  inherit (pkgs) cups cups-pk-helper cups_filters gutenprint;
   
     cfg = config.services.printing;
   
  
positive.code:     name = "cups-progs";
      paths =
        [ cups additionalBackends cups_filters pkgs.ghostscript ]
        ++ cfg.drivers;
      pathsToLink = [ "/lib/cups" "/share/cups" "/bin" "/etc/cups" ];
      postBuild = cfg.bindirCmds;
  
negative.code:         '';
        };
  
        gutenprint = mkOption {
          type = types.bool;
          default = false;
          description = ''
            Whether to enable Gutenprint drivers for CUPS. This includes auto-updating
            Gutenprint PPD files.
          '';
        };
  
        drivers = mkOption {
          type = types.listOf types.path;
          default = [];
  