Cloning this repository:

git clone git://gitorious.org/~boris-de/gentoo-multimedia/boris-gentoo-multimedia.git boris-gentoo-multimedia
cd boris-gentoo-multimedia

Add this repository as a remote to an existing local repository:

git remote add boris-gentoo-multimedia git://gitorious.org/~boris-de/gentoo-multimedia/boris-gentoo-multimedia.git
git fetch boris-gentoo-multimedia
git checkout -b my-local-tracking-branch boris-gentoo-multimedia/master_or_other_branch