anchor.diff:        };
   
         hostname = mkOption {
  +        type = types.str;
           default = "";
           description ="
             Hostname to use. Leave blank to use just the hostname of machine.
  
positive.code:       };
  
        networks = mkOption {
          default = null;
          example = ["192.168.0.1/24"];
          description = "
  
negative.code:       };
  
        postmasterAlias = mkOption {
          type = types.str;
          default = "root";
          description = "Who should receive postmaster e-mail.";
        };
  
        rootAlias = mkOption {
          type = types.str;
          default = "";
          description = "
            Who should receive root e-mail. Blank for no redirection.
  