anchor.diff:  
       services.printing.extraConf =
         ''
  -        LogLevel info
  -
           DefaultAuthType Basic
   
           <Location />
  
positive.code: 
      WebInterface ${if cfg.webInterface then "Yes" else "No"}
  
      ${cfg.extraConf}
    '';
  
  
negative.code:         '';
        };
  
        logLevel = mkOption {
          type = types.str;
          default = "info";
          example = "debug";
          description = ''
            Specifies the cupsd logging verbosity.
          '';
        };
  
        extraFilesConf = mkOption {
          type = types.lines;
          default = "";
  