Cloning this repository:

git clone git://gitorious.org/xf86-video-s3c64xx/xf86-video-s3c64xx.git xf86-video-s3c64xx
cd xf86-video-s3c64xx

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

git remote add xf86-video-s3c64xx git://gitorious.org/xf86-video-s3c64xx/xf86-video-s3c64xx.git
git fetch xf86-video-s3c64xx
git checkout -b my-local-tracking-branch xf86-video-s3c64xx/master_or_other_branch