Problem installing mysql gem

I've been running mysql4 for a while fine, and yesterday updated to mysql5. Had to reinstall the gem apparently. I followed the instructions at

to get the patch and everything. All the steps completed without a hitch, exactly as described on the blog. However when I run gem list, mysql isn't included in it. So all the commands ran fine, but gem apparently isn't recognizing the mysql gem. I used darwinports to install mysql, so the only difference in my setup was that I used

sudo /usr/local/bin/ruby extconf.rb install mysql -- --with-mysql-config=/opt/local/bin/mysql_config5

as the install command. Any ideas?

Pat