From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric J Haywiser <ejh1@MIT.EDU>
Subject: org-5.15 & emacs 21 compatibility: time-date.el version issue
Date: Thu, 29 Nov 2007 15:54:06 -0500 (EST)
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Cc: larsi@gnus.org

Dear orgers,

Sometime between org-5.10 and org-5.15 the agenda command C-a a began 
initiatating a call to a new command time-subtract.

Unfortunately, time-subtract is not present in the time-date.el
that is shipped with some emacs 21.

In the older date-time.el subtract-time is provided instead.

Adding the following to ones startup under emacs 21 seems resolve this:

(load-library "time-date")
(if (not(fboundp 'time-subtract))
     (defalias 'time-subtract 'subtract-time)
   )

Would distributing such tweaks/backports in an emacs21
subdir of org much like the xemacs tweaks be appropriate?