Has anyone actually seen ghc link successfully to third party libraries on windows? While I have been able to link to C object code compiled by ghc (and thus gcc by proxy), I have not been able to actually link against any substantial third party library or dll in windows. I am currently attempting to link to an amd linear algebra library that was compiled, in fact via gcc (libacml.a) . As soon as I include the following statement in my haskell code foreign import ccall "acml.h daxpy" daxpy:: CInt -> CDouble -> Ptr CDouble -> CInt -> Ptr CDouble -> CInt -> IO () and then link against the acml library using ghc via flags of the form ghc -O2 -fglasgow-exts main.hs -L. -llibacml my executable becomes a "do nothing" routine. That is inclusion of the foreign import prevents any output from occurring even though it compiles just fine. In fact this happens even if I don't use daxpy in the code. Removal of the foreign import allows the program to run. The same problem occurs whether or not I'm linking against a static library or a library providing stubs for a .dll. -- View this message in context: http://www.nabble.com/Linking+to+third+party+libraries+in+windows-t1681736.h... Sent from the Haskell - Haskell-Cafe forum at Nabble.com.