Re-compiling modules

Hi All, I'm *attempting* to recompile the rlm_mschap module with a quick mod to hopefully fix my host authentication domain extraction problems. Is this as simple as running make, and copying the resulting files to "/usr/lib" (on my system atleast)?? And if so, is it just the two files I need to copy, the .la and the .so? If this eventually works I'll rebuild my rpms, but I'm looking for a quick way of finding out if this does actually behave as expected. Sorry if this is a bit of an obvious question - I've never really done much C before. Many Thanks, Rupert