Cloning this repository:

git clone git://gitorious.org/~worker73/0xdroid/worker73s-system_core.git worker73s-system_core
cd worker73s-system_core

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

git remote add worker73s-system_core git://gitorious.org/~worker73/0xdroid/worker73s-system_core.git
git fetch worker73s-system_core
git checkout -b my-local-tracking-branch worker73s-system_core/master_or_other_branch