Using GHC and FFI

Hello, I try to use the FFI, but it doesn't work. I write: int test (void) { return 2; } and compiled this. So I created a file named project.obj. Then I wrote a Lhs File named test.lhs

module Blah where

import Foreign.C.Types(CInt) foreign import ccall test :: CInt

blah = test

After that I wrote ghc -fffi -c test.lhs. But when I call blah from ghci I get the error message: "test.o unknown symbol '_test' I think ghc doen't link test.o to projekt.obj. What do I have to do? Thx Dominik