Cloning this repository:

git clone git://gitorious.org/0xdroid/external_bluez.git external_bluez
cd external_bluez

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

git remote add external_bluez git://gitorious.org/0xdroid/external_bluez.git
git fetch external_bluez
git checkout -b my-local-tracking-branch external_bluez/master_or_other_branch