Software ghostscript

Here: http://pages.uoregon.edu/koch/ but consider that is not mandatory to run Scribus. Read here: http://wiki.scribus.net/canvas/Ghostscript ("Ghostscript is needed by Scribus for two purposes, namely the print preview (File > Print Preview) and the rasterisation of EPS files in image frames. If you don't need one of those features, you can safely ignore the warning message displayed by Scribus in case Ghostscript isn't installed. Contrary to some reports in the press, Ghostscript is not required for PDF or EPS export, since Scribus has its own code to handle this feature.").

Many of the open source printer drivers used on Mac OS X rely on Ghostscript. You can find a Ghostscript installer for Mac OS X on the OpenPrinting.org site. For use with Scribus, you do not need the Foomatic-RIP package.