bug#6992: 23.2; Symbol's value as variable is void: original-date

[Leo]

To reproduce:

emacs -q -l test.el

,----[ test.el ]
| (eval-after-load 'diary-lib '(appt-activate 1))
| (appt-make-list)
`----

I see the following in *Message*:

  eval-buffer: Symbol's value as variable is void: original-date

Subsequently appt-make-list errs with that msg.

This cannot be reproduced in emacs 22.1.

Leo