Modifying lightweight IP stack

Hello. I am currently using the lwip stack, and I'd like to modify it in order to move some of the functionality to HW. I see that the includes come from altera_lwip\UCOSII\src\downloads\lwip-1.1.0, but I got the impression that my function calls get linked to pre-compiled object code. Is there a clean way to have the NIOS II IDE use the available source when building?

edit: Nevermind. It appears that the lwip source gets compiled when I build all.

--Jordan