Finale to this thread...
Several old discussions mentioned Xcode as the culprit
But I installed that months ago and have used it ever since so I ignored the
message
But then I thought why not reinstall
And reinstall of Xcode seems to have fixed the problem
So install graphviz 2.12 and reinstall Xcode seems to have solved Rgraphviz
load problem on MacOS 10.4.10
Thank you and sorry for wrong list and terse emails
It is true that when using R.app these nuances are not easy to pick up
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