Cloning this repository:

git clone git://gitorious.org/cl-yacc-ebnf/cl-yacc-ebnf.git cl-yacc-ebnf
cd cl-yacc-ebnf

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

git remote add cl-yacc-ebnf git://gitorious.org/cl-yacc-ebnf/cl-yacc-ebnf.git
git fetch cl-yacc-ebnf
git checkout -b my-local-tracking-branch cl-yacc-ebnf/master_or_other_branch