I just downloaded the full tarball for 21.4.4 and tried to build it on
Solaris 2.7.  I also downloaded the latest xemacs and mule sumo
tarballs.  Everything compiles but it fails to run temacs.  It dumps
core at this point:
Loading /apps/public/XEmacs/src/xemacs-21.4.4/build-motif/lisp/auto-show.elc...
Loading /apps/public/XEmacs/src/xemacs-21.4.4/build-motif/lisp/loadhist.elc...
Loading /apps/public/XEmacs/src/xemacs-21.4.4/build-motif/lisp/loaddefs.elc...
Loading /apps/public/XEmacs/lib/mule-packages/lisp/egg-its/dumped-lisp.el...
Loading egg-sj3-leim...
Loading /apps/public/XEmacs/lib/mule-packages/lisp/skk/dumped-lisp.el...
Loading skk-leim...
Loading skk-foreword...
Loading advice...*** Error in XEmacs initialization
(void-function byte-compile)
*** Backtrace
  really-early-error-handler((void-function byte-compile))
  byte-compile(documentation)
This looks exactly like the same error I had reported for 21.4.0
except I've updated everything.  Back then I just reinstalled the
individual mule packages which DON'T have a dumped-lisp.el file in
them.  Everything worked after that, I think.
I'm going to try to just delete the dumped-lisp.el files (in egg-its
and skk) and see what happens....
Ok. That went fine.  I just checked the egg-its package and it doesn't
have a dumped-lisp.el file in it, but the mule sumo does.  A packaging
error?
Ray