[Haskell-cafe] various dependencies breakages

[Max Bolingbroke]

Cabal can handle multiple versions of libraries, but you need to find
a consistent set of libraries when building any one executable, since
they are all going to be linked together. In this case Cabal has
apparently failed to find such a set.

You might be able to get this to work with cabal instal gitit
--constraint='datetime==0.1', since that version only demands
QuickCheck > 1.2, and gitit doesn't specify a datetime version. I
haven't tried this though.

Happstack-util should probably not depend on QuickCheck at all if the
"tests" flag is False -- this appears to be an omission in their Cabal
file (http://hackage.haskell.org/packages/archive/happstack-util/0.4.1/happstack-util.cabal).
The datetime package doesn't appear to make this a configurable
dependency at all...

Cheers,
Max

On 9 February 2010 10:40, Thomas Girod <thomas at 0xc29.net> wrote:
> Hi there.
>
> I'm trying to reinstall gitit after updating to ghc 6.12 and it's
> driving me crazy. I hope you will be able to help me troubleshoot this
> mess ...  I'm starting from scratch again, using cabal. I will
> post more problems as they appears.
>
> $ cabal install gitit
> Resolving dependencies...
> cabal: cannot configure datetime-0.2. It requires QuickCheck ==2.*
> For the dependency on QuickCheck ==2.* there are these packages:
> QuickCheck-2.1, QuickCheck-2.1.0.1, QuickCheck-2.1.0.2 and
> QuickCheck-2.1.0.3.
> However none of them are available.
> QuickCheck-2.1 was excluded because happstack-util-0.4.1 requires
> QuickCheck
> <2
> QuickCheck-2.1.0.1 was excluded because happstack-util-0.4.1 requires
> QuickCheck <2
> QuickCheck-2.1.0.2 was excluded because happstack-util-0.4.1 requires
> QuickCheck <2
> QuickCheck-2.1.0.3 was excluded because happstack-util-0.4.1 requires
> QuickCheck <2
>
> Can't cabal handle several versions of the same library in parallel ? If
> not, how can I solve this problem ?
>
> cheers
>
> tom
>
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