path not under version control?

I'm trying to diff a vendor branch against a checked-out trunk to verify
that the merge I'm about to do is from the correct base version. When I
issue the diff as "svn diff https://.../vendor/version ." I get "svn: A
path under version control is needed for this operation". The directory I'm
in definitely contains a .svn subdirectory, so the check out seems to have
gone ok. What am I missing?

I'm using a Windows svn client against subversion-1.0.4-2 on Fedora Core 2.

(How can I tell what version the client is? It doesn't recognize the common
-V switch for querying an app's version. I think it's the version that
precedes today's release.)

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Received on Sat Jul 24 01:48:41 2004