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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Starting a new cvs repo in VC
Date: Thu, 03 Mar 2011 01:10:00 -0500
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> From: Evans Winner <ego111@gmail.com>
> Newsgroups: gnu.emacs.help
> Date: Wed, 02 Mar 2011 15:11:44 -0700
> 
> It does seem odd, though, that, starting from a directory that is
> not under any version control, C-x v v in a file does offer to
> create a new... something... using RCS, or SCCS, Bzr, Git, etc., but
> not CVS.

This happens because there's no create-repo method implemented for the
CVS backend:

  (vc-find-backend-function 'CVS 'create-repo) => nil

When that happens, Emacs cannot DWYM when you type "C-x v v" for an
unregistered file.  So it only offers you backends which do have a
create-repo method implemented.  Feel free to report that as a bug, at
least in the documentation.