Cloning this repository:

git clone git://gitorious.org/motorofl/android_external_busybox.git android_external_busybox
cd android_external_busybox

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

git remote add android_external_busybox git://gitorious.org/motorofl/android_external_busybox.git
git fetch android_external_busybox
git checkout -b my-local-tracking-branch android_external_busybox/master_or_other_branch