This sync works well enough for me in basic use of calendar, diary,
and, especially, timeclock in combination with planner (my motivation
for the sync).
Please test this if you can and let's fix any issues together to
complete this sync.
Look for (featurep 'xemacs) to see where I had to bend.
Also interesting for review: All lines marked with
;; XEmacs change
I save the archives some 500KB by sending ChangeLog and patch as one