Configuring Codeigniter/Resin/MySQL

[eluser]Unknown[/eluser]
I cannot seem to get Codeigniter/Resin/MySQL configured correctly. I get the error:

[show] com.caucho.quercus.QuercusRuntimeException: 'CI_DB_mysql_driver' is an
unknown class name.

[eluser]Unknown[/eluser]
I am getting the same error with CodeIgniter 1.7.2 and Resin 3.1.9 on CentOS. Anyone have a solution to this?