openAL and Assaultcube

[Mousikos]

I'm trying to refactor the code so that it makes more sense.

That's a bold statement and I won't comment on if it is or not a fruitless endevour, but I hope you suceed in doing it.

Assuming you are already have setup NetBeans (configs, library and include paths, etc, etc) and that you can produce the ac_client.exe or ac_server (with no errors/warnings) only then
your objective is clear: refactor your code as you've said, looking for dependencies and resolving them.
Try to post concrete questions and maybe someone could help you here but I think those kind of questions are more appropriate for a programming forum.

I'm doing it for fun. I like seeing clean code.