[XeTeX] pgf and xdvipdfmx on the mac

[Martin Steer]

This is a kind of follow-up to Malcolm Ross's question about trimming
an included pdf file. 

I use pgf for graphics in xetex documents, on a Linux machine. My
impression, from glancing at the archives, is that the xdvipfmx driver
is now also usable on a mac. If that is so, would someone kindly
outline the steps necessary for obtaining and installing the driver.

--
Martin