Cloning this repository:

git clone git://gitorious.org/freebroid/external_openssl.git external_openssl
cd external_openssl

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

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