How to modify the JBuilder classpath (by editing jbuilder.config)

I recently started creating a few OpenTools for JBuilder. One of the instructions you see when you first start creating an OpenTool is that you need to modify your JBuilder classpath during OpenTool development so the classpath includes the location of your OpenTool files. But, the instructions I found were for old versions of JBuilder (that were no longer valid), which leads to the question "How can I modify the JBuilder CLASSPATH to recognize the location of my custom class files?"

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