I know it's been a while since this thread has been created, but I stumbled across the same problem on Ubuntu and found a solution so maybe it can help others.
Contrary to Mandriva with which I'm a little bit more familiar, I couldn't find the MyODBC setup driver in any of the Ubuntu packages. So I went directly to the MyODBC Web site and picked up the latest Linux ODBC connector for MySQL:
and voilą! The generic .tar.gz Linux file contains all the needed files (both driver and setup), just copy them where you want them and use them with unixODBC. Hope this helps!