libmysqlclient.15.0.0.dylib - shared library for MySQL version 5.0

select the appropiae file for PPC or Intel i686 architecture
the libraries are made from source

put this library in /usr/local/mysql/lib then do:

/usr/local/mysql/lib> sudo ln -s libmysqlclient.15.0.0.dylib libmysqlclient.15.dylib
/usr/local/mysql/lib> sudo ln -s libmysqlclient.15.0.0.dylib libmysqlclient.dylib

A MySQL v. 5.0 dmg installer is available at http://dev.mysql.com/downloads/mysql/5.0.html