Compiling just one module - how?

I’d like to apply some patches and recompile the meetme app. Can I just recompile app_meetme.c instead of the all of asterisk? How? Don’t know much about gcc…

Generally, if you have already done a make successfully, patch the system, and then make again, it should only build the new objects. Not sure how to break down the Makefile for a specific object.