git clone ssh://username@git.code.sf.net/p/maritaca/experimental maritaca-experimental
cd maritaca-experimental
git remote add upstream ssh://username@git.code.sf.net/p/maritaca/gcode
git remote add upstream git://git.code.sf.net/p/maritaca/gcode
git fetch upstream
git push origin master
git fetch upstream
git merge upstream/master
For configuring the development environment please see the Setting up the development environment guide, taking into account that the repository must be change to maritaca/experimental.