from preamble:

"Change Set:		MacOSXGraphVizGenerator-dd
Date:			8 March 2005
Author:			Dominique Dutoit

To use this generator, you have to download the port made by pixelglow
(http://www.pixelglow.com/graphviz/) and install the Graphviz
application in your Applications folder. This generator runs both under
Carbon and Unix versions of the Squeak VM."!
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