Ok so, Android devs/Unix kernel builders I have a question.

How can I set `make` command to speed up the building process?
I'm very confused because of the N in the `-jN` parameter.
I read someone suggesting N=n_cores+1, btw I have an old dual core PC without hyperthreading eoth 4gb RAM.

If someone can explain me how this parameter works and how ti use it in order to minimize the building time I would be really grateful.

Thanks :)