PlantUML / graphviz: Dot executable /usr/bin/dot does not excist

OS: Redhat Enterprise Linux Server release 5.6

Trying to get graphviz to work with PlantUML and mediawiki. Sequence Diagram works so I assume it does not require graphwiz.

But for everything else I get a image saying

/usr/bin/dot executable file does not exist etc

But the file does exist in this directory and I can run Java -jar plantuml.jar -testdot, but here might also be the problem I can only run it if I am in /root/PlantUML (Where I downloaded PlantUML).

What might I be missing?

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