Graphviz plug-in error: "cannot run program "dot": error=2, No such file or directory

Hello. I've just started to use gephi and am trying to use the Graphviz plug-in. But I'm getting the error that's in the subject line of this issue.

I'm aware that some Mac users have had issues with Graphviz and El Capitan, which is my OS (version 10.11.5). I've followed the instructions [in this post on the Graphviz forum](http://www.graphviz.org/Download_macos.php#comment-2730), and was able to open the "hello.dot" file in Graphviz, so it's installed properly.

I tried uninstalling/reinstalling the plugin after I did all of the instructions from that post, but it still won't work. I don't see anywhere in gephi to adjust where it looks for Graphviz.