Using Cabal for a simple wrapper library

Hello I am trying to use Cabal for a small library that essentially just wraps a C library. There seems to be no (documented) way of linking the produced library with an external library. Basically I have libfoo.so and libfoo.a, and would need the cabalized package to link to either of them. I am trying to use Distribution.Simple and my Setup.description looks like: Name: qdbm Version: 0.1 License: LGPL Copyright: (c) Einar Karttunen 2004 Stability: alpha Build-Depends: haskell-src Modules: Database.QDBM.Depot Maintainer: Einar Karttunen Extra-Libs: qdbm Extensions: ForeignFunctionInterface -- -fglasgow-exts is needed for data without a constructor -- -#include is a hack -- -cpp needs a better way of saying it -- And how should the library be linked really? Options-ghc: -cpp -fglasgow-exts -O2 -#include - Einar Karttunen