scope of header files

I was under the impression that with ghc, ffi import declarations like this do not escape the module: foreign import ccall unsafe "foo.h foo" foo :: IO () However it seems that this one does: foreign import ccall unsafe "curses.h & stdscr" stdscrp :: Ptr WINDOWptr from: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/mage-1.0 perhapsPbecause it's a pointer import it gets treated differently? Is this correct and expected behaviour? It's hard to tell what header files need to be used globally and inherited by client packages and which can safely be used privately. Duncan