Cloning this repository:

git clone git://gitorious.org/~bearsh/gentoo-arm-overlay/bearsh-gentoo-arm-overlay.git bearsh-gentoo-arm-overlay
cd bearsh-gentoo-arm-overlay

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

git remote add bearsh-gentoo-arm-overlay git://gitorious.org/~bearsh/gentoo-arm-overlay/bearsh-gentoo-arm-overlay.git
git fetch bearsh-gentoo-arm-overlay
git checkout -b my-local-tracking-branch bearsh-gentoo-arm-overlay/master_or_other_branch