Install mysql gem on OS X 10.5

I had a little trouble installing the mysql gem on OS X 10.5 this morning so I thought I would post the solution.

1) Download the mysql binaries from apple http://support.apple.com/kb/TA25017?viewlocale=en_US
2) Unpack the binaries.
3) sudo gem install mysql -- --with-mysql-config=/usr/bin/mysql_config (be sure to give an absolute path to the config file)
4) done