Which Oracle connector for AR?

What DB connector do I need to talk to a network accessible Oracle
server: 1) with ActiveRecord?, 2) to perform basic SQL. I'm more
familiar with what it takes to get MySQL working with AR. Currently I
have AR 2.1.1, Ruby 1.8.5. I'll have to ask what Oracle client/server
is available.

This question pertains to a RedHat 5 system which is not managed by me
and is only allowed RedHat managed packages, unless I install them in
my user space (/home).

Rob

# gem list --local |grep oracle
activerecord-oracle_enhanced-adapter (1.2.0)

Awesome, thanks!