I made a Delphi dll (32 bits windows). This dll exports a function named getPngVersion. This is a function with no arguments that returns a pointer to a array of chars. If I examine the dll with a tools like tdump, I can see the function getPngVersion on index 1. Now I want to use this dll in Haskell: {-# LANGUAGE ForeignFunctionInterface #-} module Main( main ) where import Control.Monad import Foreign.C import Foreign.Marshal.Alloc import Foreign.Marshal.Array import System.Win32.Types foreign import stdcall "glasPng getPngVersion" getPngDllVersion :: IO CString main :: IO () main = do s <- getPngDllVersion putStrLn (show s) Compiling this with ghc --make glasPng.hs gives: GlasPng.o: fake: (.text +0x82): undefined reference to 'getPngVersion@0' collect2 : Id returned 1 exit status I wonder what went wrong. In the foreign import line I use "glasPng.. " to tell ghc, it has to searh in glasPng.dll (changing glasPng to glasPng.dll doesn't help). I've changed the name of the function in the dll to getPngVersion@0 but no luck. I've read and tested the last example at http://stackoverflow.com/questions/1027246/haskell-foreign-import-stdcall-on -dll-function (win32_getComputername, this works!). I wonder how haskell knows which dll to use in this example?) Probably I'am doing something wrong with the way I tell ghc which dll to link or.. Any ideas? Kees