Install a cvs version after a tar.gz package

[Rodolfo Medina <rodolfo.medina@gmail.com>]

I installed in my Debian Etch box AUCTeX, version 11.84, from the tar.gz
tarball.  Now I want to update the program with its cvs version.

How can uninstall the version already installed?  Or maybe I can override the
old one installing straight away the cvs version?

Thanks for any help
Rodolfo