The last time I tried this, Eclipse did not support direct access to local repositories in the same way as the cvs command line does, because the cvs command line has both client and server functionality, while Eclipse has only client functions and should pass (for example) pserver, so you probably need to start the cvs server.
It turns out that I really did not need it, since Eclipse stores its own history of all changes, so I only needed to manually update cvs at the main stages.
[In the end, I decided not to use cvs at all with Eclipse under Linux, as it got confused in the symbolic links and started deleting my included files when it was “synchronized” with the repository.]
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