I have installed graphviz 2.28.0 on a Windows 7 machine and Rgraphviz
1.30.1.  The command library(Rgraphviz) in R throws a message box stating
that libcdt-4.dll is missing.  The folder C:\Program
Files\Graphviz2.28.0\bin does not contain this DLL.  What is the version of
graphviz that is compatible with Rgraphviz 1.30.1?

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