Cloning this repository:

git clone git://gitorious.org/emacs-mt/emacs-mt.git emacs-mt
cd emacs-mt

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

git remote add emacs-mt git://gitorious.org/emacs-mt/emacs-mt.git
git fetch emacs-mt
git checkout -b my-local-tracking-branch emacs-mt/master_or_other_branch