painthud.c

==========
void Add_message(char *message)
[...]
        msg_set = TalkMsg;
      } else {
        msg_set = GameMsg;
+         if ( strstr(message, "has entered") != 0 ){
+           XBell(dpy, 100); /* like a ^G or \007 on Unix */
+         }
      }
      tmp = msg_set[maxMessages - 1];
      for (i = maxMessages - 1; i > 0; i--) {

[...]