cvs diff -r RC_FOO_BAR equivalent?

Do I really have to do

svn diff --old svn://repos/project/tags/RC_FOO_BAR .

to get differences between the stuff in my current directory and
repository? moreover that doesn't seem to work either.

-- 
# Edvard Majakari		Software Engineer
# PGP PUBLIC KEY available    	Soli Deo Gloria!
$_ = '456476617264204d616a616b6172692c20612043687269737469616e20'; print
join('',map{chr hex}(split/(\w{2})/)),uc substr(crypt(60281449,'es'),2,4),"\n";
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