--compare-dest not working for me. what am I doing wrong?

[Wayne Davison]

On Thu, Nov 15, 2007 at 10:29:58PM +0100, Lucas Meijer wrote:
> mkdir a b c
> echo foo > a/test
> echo foo > b/test
> rsync -av --compare-dest=../b a/ c/

The two test files don't match in their preserved attributes.  They must
either have the same mtime, or you must not ask rsync to preserve times.

..wayne..