Compile error in event-gtk.c with gtk on RH9

Hello; I'm trying to compile xemacs-21.5.11 under RH 9 (gcc 3.2.2-5) I used ./configure --with-gtk and get the following error in event-gtk.c In file included from event-gtk.c:101: event-xlike-inc.c: In function `emacs_gtk_event_pending_p': event-xlike-inc.c:82: `non_fake_input_wait_mask' undeclared (first use in this function) event-xlike-inc.c:82: (Each undeclared identifier is reported only once event-xlike-inc.c:82: for each function it appears in.) make[1]: *** [event-gtk.o] Error 1 The failure is at if (poll_fds_for_input (non_fake_input_wait_mask)) It looks suspiciously that some declaration like: extern SELECT_TYPE non_fake_input_wait_mask; is missing (by analogy to event-Xt.c and event-tty.c) --- but that's just a WAG. Thanks! PS: I assume it's a known issue that the buffer tabs don't appear in gtk enabled versions? If so: Any hope? If not: need details? Thanks again bruce