vc-directory ignores .cvsignore?

[Sam Steingold <sds@gnu.org>]

GNU Emacs 23.0.50.3 (i686-pc-linux-gnu, GTK+ Version 2.12.3)
 of 2008-01-09 on loiso
 '--with-gtk'

I have been using PCL-CVS for "multi-file commits" and VC for single
file commits until I was forced to use baz and now hg at work.
since it appears that cvs is losing ground not to svn but to git/bzr/hg,
I decided to give C-x v d (vc-directory) a try.
the first thing I discovered was that .cvsignore appears to be ignored:

here is the "dired under cvs" buffer:

==========================================================
  /usr/local/src/clisp/current:

  /usr/local/src/clisp/current/build-g/bindings/glibc:

  -rw-rw-r-- (modified) Jan 22 18:48 linux.lisp
  -rw-rw-r-- (modified) Jan 22 17:27 test.tst

  /usr/local/src/clisp/current/build-g-gxx/bindings/glibc:

  -rw-rw-r-- (modified) Jan 22 18:48 linux.lisp
  -rw-rw-r-- (modified) Jan 22 17:27 test.tst

  /usr/local/src/clisp/current/build-mt/bindings/glibc:

  -rw-rw-r-- (modified) Jan 22 18:48 linux.lisp
  -rw-rw-r-- (modified) Jan 22 17:27 test.tst

  /usr/local/src/clisp/current/doc:

  -rw-rw-r-- (modified) Jan 20 04:23 _clisp.1
  -rw-rw-r-- (modified) Jan 20 04:22 _clisp.html
  -rw-rw-r-- (modified) Jan 20 04:22 impnotes.html

  /usr/local/src/clisp/current/modules/bindings/glibc:

  -rw-rw-r-- (modified) Jan 22 17:27 test.tst
==========================================================

/usr/local/src/clisp/current/.cvsignore lists "build*", i.e., all
build-* directories are just that - hard and soft links of sources and
compiled files.
so, why are they listed here?
I understand that this is because the CVS directories are linked over
too, but why are these directories descended into?

thanks.

-- 
Sam Steingold (http://sds.podval.org/) on Fedora release 8 (Werewolf)
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