XEmacs 21.4, vc-git.el and utf-8

Hauke Fath writes:
 > (require 'un-define)
 > 
 > appears to help, but seems to be frowned upon.
 > 
 > What is the proper way to use vc.git.el on 21.4?

If vc-git requires UTF-8, as your question appears to imply, then
there is no "proper" way to use it in XEmacs 21.4.  un-define may work
well enough, but as far as I know it's completely unsupported (I
certainly won't touch it), and there is no other way to use utf-8 in
XEmacs 21.4.

If you're lucky there may be somebody around who can help debug
problems with the Mule-UCS package, but my recommendation is to take
this as a sign to move on to 21.5.

Sorry.