Cloning this repository:

git clone git://gitorious.org/0xdroid/external_ipsec_tools.git external_ipsec_tools
cd external_ipsec_tools

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

git remote add external_ipsec_tools git://gitorious.org/0xdroid/external_ipsec_tools.git
git fetch external_ipsec_tools
git checkout -b my-local-tracking-branch external_ipsec_tools/master_or_other_branch