Although there are some great binary distributions for MySQL and PostgreSQL, both build out of the box on Mac OS X. This chapter describes how to install them from source and get them set up so you can start playing with them. Fink is a good first stop for MySQL or PostgreSQL, since you can use it to install a binary build or compile from source.
You can also get MySQL as a binary package from MySQL AB (http://www.mysql.com), as well as Server Logistics (http://www.serverlogistics.com/). Server Logistics offers a selection of open source packages, one of which is Complete MySQL (http://www.serverlogistics.com/mysql.php), which includes the MySQL server, a System Preferences pane for MySQL, ODBC/JDBC drivers, and documentation.