[cffi-devel] Access to code

Running under linux mint 14 64 bit; using ccl as the lisp. I have been looking at the examples provided with the cffi material, as well as at the manual, to see how the wrapping of c functions seems to work. These are very helpful but depend on system calls and "eveything" knows where they are. Suppose I have a set of c functions, and their .o files too, which I would like to wrap using defcfun and relatives. What precautions must I take in making known to ccl the locations(s) of these foreign files ? Is it a bit like asdf with a *central-registry* to hold such locations, or have I missed some obvious pointer to the answer ? Thanks for any and all assistance. Cheers /Greg Bennett