anchor.diff:        };
   
         interface = mkOption {
  +        type = types.str;
           default = "127.0.0.1";
           description = ''
             The interface the BitlBee deamon will be listening to.  If `127.0.0.1',
  
positive.code: 
        portNumber = mkOption {
          default = 6667;
          description = ''
            Number of the port BitlBee will be listening to.
          '';
  
negative.code: 
        extraDefaults = mkOption {
          default = "";
          type = types.lines;
          description = ''
            Will be inserted in the Default section of the config file.
          '';
  