Hi all -
I just experienced a problem I didn’t even realize I had. The problem
was
that I have installed the native mysql gem, but it wasn’t being used. I
base this on this post:
http://blog.duncandavidson.com/2005/07/rails_and_mysql.html
I tried that on my mac and it returned true. Looking through
/usr/local/lib/ruby for mysql.so revealed that it was in a different
spot
on my mac than on my linux box.
Specifically, the file:
/usr/local/lib/ruby/site_ruby/1.8/i686-linux/mysql.so
did not exist. While it did (with slight path change) on my mac.
I copied the file from:
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.7/lib/mysql.so
and checked again and it was now using that driver. It also reported an
error relating to /etc/my.cnf (local sock) which seems to also confirm
it.
I’m saying all this because I had thought the gem was installed. I had
confirmed the .so file was created, etc. But it still wasn’t being
used.
And perhaps some other folks have the same issue. Or not. 
-philip