[jhc] including C source files?

Hi all, I was wondering what we are supposed to do to include C source files, accessed via the FFI? Including them on the command line (as I was tempted to do) just results in a complaint that they aren't haskell. Do I need to compile it separately with gcc and then pass the object file on the command line? I guess I could just experiment, but I'm feeling lazy, so I'm asking instead... This is with regard to getting jhc support to support the franchise test suite. It's a little embarassing that it fails the ffi portion. :( David