Install MySQL and mysql gem on Mac OS X Leopard
Install MySQL server via MacPorts:
sudo port install mysql5 +server
Setup the database:
sudo -u mysql mysql_install_db5
Configure MySQL to start up automatically when OS X boots:
sudo launchctl load -w /Library/LaunchDaemons/org.macports.mysql5.plist
Install mysql gem:
sudo gem install mysql -- --with-mysql-config=/opt/local/bin/mysql_config5
Socket location: /opt/local/var/run/mysql5/mysqld.sock.