Split out from issue185.
Benton Margulies said in passing:
I have 21.5 beta 28 (the last tarball?) install on ubuntu gutsy
gibbon in /opt/xemacs.
It runs fine as /opt/xemacs/bin/xemacs. -- that is, after I
installed a sumo. The package manager refused to run, and
README.packages is missing entirely from that tarball.