#376: Allow constraint on using installed package versions ---------------------------------+------------------------------------------ Reporter: duncan | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: HEAD Severity: normal | Resolution: Keywords: | Difficulty: normal Ghcversion: 6.8.3 | Platform: ---------------------------------+------------------------------------------ Comment (by duncan): This is now supported internally. We just need a way to pass the constraints in via the command line interface. I'm thinking of using: {{{ cabal install foo --constraint="bar installed" }}} which mirrors the existing: {{{ cabal install foo --constraint="bar >= 1.2" }}} and similarly we could add flags constraints for particular packages: {{{ cabal install foo --constraint="bar +gtk -vty" }}} but perhaps flags want a different approach. Suggestions welcome. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/376#comment:4 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects