setup

sudo gem install merb --source http://edge.merbivore.com

Ruby 1.8.6 (ruby -v)
Rubygems 1.3.1 (gem -v)
  gem update --system
XCode 3.x
Macports 1.700 (port version)
  sudo port selfupdate
  sudo port install kcachegrind
  sudo port install graphviz
  sudo port install memcached libmemcached
  sudo launchctl load -w /Library/LaunchDaemons/org.macports.memcached.plist
  sudo port install cdargs
  sudo port install siege

  sudo port clean --all <problem port>
    and try again

MySQL (http://dev.mysql.com/get/Downloads/MySQL-5.1/mysql-5.1.30-osx10.5-x86.dmg/from/pick)
JRuby 1.1.6 (jruby --version)
  dist.codehaus.org/jruby/1.1.6
  add jruby bin to path
Gems (MRI and JRuby):
  mongrel 1.1.5 (gem list mongrel)
  merb 1.0.8.1 (gem list merb)
  thor 0.9.9 (gem list thor)
  textmate 0.9.2 (gem list textmate)
  env ARCHFLAGS="-arch i386" gem install memcached -- --with-libmemcached-dir=/opt/local
  gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

textmate install "Ruby Haml" github
textmate install Rspec GitHub
jruby -S ... to run commands with jruby