Cloning this repository:

git clone git://gitorious.org/~bumblebee/colibri-t20-embedded-linux-bsp/bumblebees-colibri_t20-linux-kernel.git bumblebees-colibri_t20-linux-kernel
cd bumblebees-colibri_t20-linux-kernel

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

git remote add bumblebees-colibri_t20-linux-kernel git://gitorious.org/~bumblebee/colibri-t20-embedded-linux-bsp/bumblebees-colibri_t20-linux-kernel.git
git fetch bumblebees-colibri_t20-linux-kernel
git checkout -b my-local-tracking-branch bumblebees-colibri_t20-linux-kernel/master_or_other_branch