where is the Freestyle module gone?

I have installed the latest stable build from graphicall. However, unlike the previous version, it appears that the Freestyle render options are missing.

Is this the case? Is it a separate install? How? Where?
I am on a Mac so it may not be implemented yet for OSX?

Freestyle is currently in a separate branch of the code, and is not yet included in trunk builds (like the official 2.53 beta release). You can download a Freestyle build on Graphicall (right now the only builds that include Freestyle are clearly marked as Freestyle builds), or download the source and compile it yourself.