[Haskell-iPhone] libffi or other ways of calling varargs functions

Howdy, Is there a recommended way of calling varargs functions from ghc-iphone? Is it libffi or something else? Thanks, David -- Visi.Pro, Cloud Computing for the Rest of Us http://visi.pro Lift, the simply functional web framework http://liftweb.net Follow me: http://twitter.com/dpp Blog: http://goodstuff.im