Adding external java projects to GWT project

Hey,
I'm really new to GWT, its maybe very simple but i couldn't get how to do it.

I want to add code from external java project to my gwt project. (boofcv.org)
not just class files but whole hierarchy of code.

boofcv consists of several java projects that each one of them have his own build.xml, src folder etc

https://github.com/lessthanoptimal/BoofCV/tree/master/main

Thanks!

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