Christoph Wedler <wedler(a)fmi.uni-passau.de> writes in xemacs-beta(a)xemacs.org:
 I have a suggestion for XEmacs.rules.  In order not to get errors
during
 re-installation in the case when some files are read-only, I would
 suggest that all file permissions are changed with `chmod u+w'. 
I don't think this is the right fix.  By design, the XEmacs package
sources are supposed to be read+write for owner and group.  If that is 
not the case, then the source of the problem -- the CVS tree should be
fixed.