Possible bug with version numbers in add-log (Emacs 21.1)

[Andrew Wiseman]

I use add-log on our 4GL database scripts which are under SCCS control.
If I set add-log to enable version numbers, then this works a treat when
I use M-x vc-comment-to-change-log after checking in changes.

But if I try to add an entry manually, or start any other ChangeLog, the
process fails.

Example:

start emacs, then:

        M-x set-variable change-log-version-info-enabled
        Set change-log-version-info-enabled to value: t (RET)
        C-x C-f
        Find file: /tmp/scratch (RET)
        M-x add-change-log-entry
        Log file (default ChangeLog): /tmp/ (RET)

I get this in the minibuffer:

        Cannot open load file: vc-nil

and the ChangeLog isn't created/modified.

I would have expected that if no version number could be found to use,
then add-change-log-entry would simply behave as if
change-log-version-info-enabled was nil.

Does this count as a bug?

regards,
Andrew Wiseman
GNU Emacs 21.1.1 (i386-pc-isc4.1a) of 2001-11-20 on fred
configured using `configure --prefix=/var --with-x=no'