git
ruby
gem (brew)

# macports
http://www.macports.org/install.php
sudo port selfupdate
sudo port install puppet
sudo puppet apply -vd --confdir .  --libdir lib --factpath facts manifests/development.pp

# homebrew
sudo chown -R `whoami` /usr/local
ruby -e "$(curl -fsSL https://gist.github.com/raw/323731/install_homebrew.rb)"
#curl -L http://github.com/mxcl/homebrew/tarball/master | tar xz --strip 1 -C /usr/local
sudo gem install puppet --no-ri --no-rdoc