This is a the classic Ruby C wrapper for MySQL (v.2.8) repackaged as a gem which will build without passing any extra parameters on many system.
It relies on the availability in path of the right mysql_config executable.
Run the following if you haven't already:
gem sources -a http://gems.github.com
Install the gem(s):
sudo gem install elia-mysql
TOMITA Masahiro is the author of the original wrapper for Mysql C library, which is released under the Ruby license.
Copyright (c) 2008 Elia Schito.