Cloning this repository:

git clone git://gitorious.org/~chedi/qt-labs/chedis-devdays-graphicssystem-plugin.git chedis-devdays-graphicssystem-plugin
cd chedis-devdays-graphicssystem-plugin

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

git remote add chedis-devdays-graphicssystem-plugin git://gitorious.org/~chedi/qt-labs/chedis-devdays-graphicssystem-plugin.git
git fetch chedis-devdays-graphicssystem-plugin
git checkout -b my-local-tracking-branch chedis-devdays-graphicssystem-plugin/master_or_other_branch