ANNOUNCE: GHC 7.0.1 Release Candidate 1

[Christian Maeder]

Am 27.09.2010 13:31, schrieb 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

The HTTP.cabal file is not correct!
  Build-depends: base >= 2 && < 4, network, parsec, mtl

(an additional constraint does not help)

Cheers Christian


>>
>> 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