Cloning this repository:

git clone git://gitorious.org/gentoo-ebuilds-maintenance/gentoo-ebuilds-maintenance.git gentoo-ebuilds-maintenance
cd gentoo-ebuilds-maintenance

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

git remote add gentoo-ebuilds-maintenance git://gitorious.org/gentoo-ebuilds-maintenance/gentoo-ebuilds-maintenance.git
git fetch gentoo-ebuilds-maintenance
git checkout -b my-local-tracking-branch gentoo-ebuilds-maintenance/master_or_other_branch