-----Urspr?ngliche Nachricht----- Von: Sergey Mironov Gesendet: 26.03.2010 10:30:06 An: beginners@haskell.org Betreff: Fwd: [Haskell-beginners] SMTPClient + hsemail-1.6 = errors
Thanks, Robert. But my real goal was to compile happstack. SMTPClient is just a dependency.
I solved the problem with ghc-pkg unregister:
ierton@vault ~ % ghc-pkg unregister hsemail-1.6 ierton@vault ~ % cabal install hsemail-1.3 ierton@vault ~ % caball install SMTPClient
You can also cabal-install with constraints. I don't remember the command-line syntax, I think it was something like cabal install 'constraint hsemail < 1.6' SMTPClient cabal install --help should tell you how exactly it ought to look. Sometimes unregistering the offending package is not an option because other packages depend on it.