Built failure on Hackage due to missing libraries

Hi everyone! Recently I uploaded package to Hackage (http://hackage.haskell.org/package/groundhog-0.0.1) and it failed with an error as if the libraries monad-control and pool were not exposed. What is the current situation with these libraries? According to Cabal FAQ this could mean that they were built with --user flag while my package is built with --global or they are not exposed at all. -- Regards, Boris