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

[Matt McCutchen]

On Thu, 2007-11-15 at 15:41 +0100, Lucas Meijer wrote:
> Can anybody spot my mistake?
> 
> mkdir a b c
> echo foo > a/test
> echo foo > b/test
> rsync -av --compare-dest=b a/ c/

Relative --*-dest paths are interpreted relative to the destination
directory (as stated in the man page), so you should use:

rsync -av --compare-dest=../b a/ c/

Matt