[jerf]

If the underlying project is unsupported, and you're only using a part of it, and the licenses permit, I'd suggest just pulling the relevant code into your own. That eliminates the underlying criticism of "depending on code that no one is maintaining" by showing that you will maintain it.

Plus, if you stick with this project and start nursing it through the ever-increasing demand for performance, you're pretty much guaranteed to do this eventually anyhow, so there's not much reason to put it off. :)