Cloning this repository:

git clone git://gitorious.org/+qt-maemo-developers/qt/qt-maemo-developers-x11-maemo.git qt-maemo-developers-x11-maemo
cd qt-maemo-developers-x11-maemo

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

git remote add qt-maemo-developers-x11-maemo git://gitorious.org/+qt-maemo-developers/qt/qt-maemo-developers-x11-maemo.git
git fetch qt-maemo-developers-x11-maemo
git checkout -b my-local-tracking-branch qt-maemo-developers-x11-maemo/master_or_other_branch