Cloning this repository:

git clone git://git.sugarlabs.org/~rbuj/calculate/catalan-mainline.git catalan-mainline
cd catalan-mainline

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

git remote add catalan-mainline git://git.sugarlabs.org/~rbuj/calculate/catalan-mainline.git
git fetch catalan-mainline
git checkout -b my-local-tracking-branch catalan-mainline/master_or_other_branch