[Haskell-cafe] haddock complains about unknown symbol in .a file

Dear all, what is happening here? http://hackage.haskell.org/package/satchmo-2.9.9.1/reports/1/log The library is built, but haddock fails with haddock: /home/builder/hackage-server/build-cache/tmp-install/lib/x86_64-linux-ghc-7.8.3/minisat-0.1.2/libHSminisat-0.1.2.a: unknown symbol `_ZGVZN7Minisat6Option13getOptionListEvE7options' Why is haddock complaining, but ghc is not? Any pointers appreciated (to explain and solve the problem - I think there's a work-around of uploading documentation to hackage but that does not feel right) - J.W.