ANNOUNCE: GHC 7.0.1 Release Candidate 1

[Daniel Fischer]

On Monday 27 September 2010 12:58:08, Christian Maeder wrote:
>
> I've tried to install HTTP (for cabal-install) and get the following
> error:
>
> Configuring HTTP-4000.0.9...
> Setup: At least the following dependencies are missing:
> base ==3.*
>
> What is the problem? The Build-depends of HTTP's cabal file look correct
> (and fulfilled):
>     Build-depends: base >= 3, array, old-time, bytestring
>
> Cheers Christian

Probably it's the preferred versions on hackage:
-- A global set of preferred versions.
--
-- This is to indicate a current recommended version, to allow stable and
-- experimental versions to co-exist on hackage and to help transitions
-- between major API versions.
--
-- Tools like cabal-install take these preferences into account when 
-- constructing install plans.
--
base < 4
parsec < 3
cabal-install < 0.10


Try installing it with --constraint="base >= 4" and if that doesn't 
suffice, --preference="base >= 4".

Cheers,
Daniel