Cloning this repository:

git clone git://gitorious.org/~cornelius/qt-creator/qt-creator-kdesdk.git qt-creator-kdesdk
cd qt-creator-kdesdk

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

git remote add qt-creator-kdesdk git://gitorious.org/~cornelius/qt-creator/qt-creator-kdesdk.git
git fetch qt-creator-kdesdk
git checkout -b my-local-tracking-branch qt-creator-kdesdk/master_or_other_branch