Show Diagram Does Not Work on Linux Install

I have the latest version of SC 7 for PHP 5.4 installed on a Linux server running Centos. Everything is working fine, but the “Show Diagram” under the Project menu does not work. The window pops up in the browser and all I see is a broken image “X” instead of the png file.

I noticed that most of the files in devel/lib/third/graphviz/bin are .exe files. I downloaded the Linux zip distribution and see that they are exe & dll files in there too. Now I don’t know if they can be executed by linux or not. The permissions were wrong so I set the exe files to 755 but it still doesn’t work.

Graphviz generates the diagram.

Any ideas why this isn’t working?

http://www.scriptcase.net/knowledge/index.php?/Knowledgebase/Article/View/44/45/application-diagram---installing-graphviz-on-a-linux

In Ubuntu Server just “apt-get install graphwiz”

Sorry for the late reply. Had the flu. Thanks for the help. I didn’t realize that I needed to install it on my server for it to work.