I am trying to run happstack on my Mac, but unfortunately I am getting error messages as described in: http://code.google.com/p/happstack/issues/detail?id=88 The cure seems to be to downgrade to network-2.2.0.1, but unfortunately my installed cabal depends on network-2.2.1.4. I tried to re-install happstack using: cabal install happstack --reinstall --constraint="network==2.2.0.2" but unfortunately the ghc happily reports to link against network-2.2.1.4: ... Loading package parsec-2.1.0.1 ... linking ... done. Loading package hsemail-1.3 ... linking ... done. Loading package network-2.2.1.4 ... linking ... done. Loading package SMTPClient-1.0.1 ... linking ... done. Loading package time-1.1.4 ... linking ... done. ... Can someone rescue me? Doaitse