Cloning this repository:

git clone git://gitorious.org/+qt-developers/maemo-6-ui-framework/qt-developers-duitheme.git qt-developers-duitheme
cd qt-developers-duitheme

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

git remote add qt-developers-duitheme git://gitorious.org/+qt-developers/maemo-6-ui-framework/qt-developers-duitheme.git
git fetch qt-developers-duitheme
git checkout -b my-local-tracking-branch qt-developers-duitheme/master_or_other_branch