epydoc.docwriter.dotgraph cannot detect the version of Graphviz dot v2.20.2 (and likely others) because the regular expression used is out of date w.r.t the output from the dot command.
OLD STYLE (fabricated example):
dot version 1.8.0 (Fri Dec 12 18:38:09 UTC 2005)
dot - Graphviz version 2.20.2 (Fri Dec 12 18:38:09 UTC 2008)
I have enclosed a patch against r1812 in SubVersion.
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