Compiling xemacs 21.5.28 on Ubuntu 7.10

I'm actually now a GNU Emacs user, not an XEmacs user, but in case this is helpful to anyone I've recorded how I figured out how to the get the XEmacs source to compile on Ubuntu 7.10.

The reason I'm no longer an XEmacs user is because it's just not keeping up with GNU Emacs, but more importantly, there is an extremely annoying bug...

Update: It appears that the "Xlib: unexpected async reply" that I refer to above is fixed in Ubuntu 8.04. Too bad I'm now using GNU Emacs...