Cloning this repository:

git clone git://gitorious.org/clutter-gtk-copy/clutter-gtk-copy.git clutter-gtk-copy
cd clutter-gtk-copy

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

git remote add clutter-gtk-copy git://gitorious.org/clutter-gtk-copy/clutter-gtk-copy.git
git fetch clutter-gtk-copy
git checkout -b my-local-tracking-branch clutter-gtk-copy/master_or_other_branch