From Copelco

Ruby on Rails Installation

sudo port -d selfupdate 
sudo port install lighttpd +ssl 
sudo port install rb-rubygems
sudo port install rb-fcgi

Add port bin directories to your path

PATH=/opt/local/bin:/opt/local/sbin:$PATH

So ruby can find gems

export GEM_HOME=/opt/local/lib/ruby/gems/1.8
export RUBYLIB=/opt/local/lib/ruby

continue

sudo gem install rails --include-dependencies
sudo gem install capistrano --include-dependencies