[Haskell] Building a library for C users

[Thomas Davie]

Hiya all,
   I'm trying to build a library that can be called from C code.  The  
ghc manual implies that this can be done, but does not specify the  
compiler options that I need to throw at it, and into which files I  
should put initialisation/end routines.  Does anyone know the magic I  
need to invoke to get ghc to produce for me (a) a header file, (b)  
preferably a dynamic library, put a static one if all else fails.

Thanks

Tom Davie