anchor.diff:  
           screenName = mkOption {
             default = "";
  +          type = types.str;
             description = ''
               Use the given name instead of the hostname to identify
               ourselves to the server.
             '';
           };
           serverAddress = mkOption {
  +          type = types.str;
             description = ''
               The server address is of the form: [hostname][:port].  The
               hostname must be the address or hostname of the server.  The
  
positive.code:           '';
          };
          address = mkOption {
            default = "";
            description = "Address on which to listen for clients.";
          };
  
negative.code:         enable = mkEnableOption "the Synergy server (send keyboard and mouse events)";
  
          configFile = mkOption {
            type = types.path;
            default = "/etc/synergy-server.conf";
            description = "The Synergy server configuration file.";
          };
          screenName = mkOption {
            type = types.str;
            default = "";
            description = ''
              Use the given name instead of the hostname to identify
  