Add Sources from Github

To add plugin from github, you may encounter problem. Add git hub as gem sources:

gem sources -a http://gems.github.com/

Install Mysql in Snow Leopard

Download / install the 64-bit MySQL 5.1.37 from mysql.com

run the following commands:

sudo gem update --system

sudo env ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config