Mostly here so to make googling for "Install Perl's GraphViz on OS X" easier.
In installing GraphViz on my new iBook, I remembered that I could not use the latest Graph.pm and thus had to fall back to 0.20105. Then I had to make the GraphViz dot executable avaialable for GraphViz.pm. One Website recommended adding
Later when I googled for that when I wanted to reinstall GraphViz, I discovered they deleted my comment. Either someone doesn't like being corrected or I gave bad advice.