[Haskell-cafe] Problem installing cabal-dev

[Bob Ippolito]

The version of cabal-dev on Hackage doesn't work with recent versions of
Haskell due to https://github.com/creswick/cabal-dev/issues/74 - You have
to install from a recent git checkout.

These instructions were done on Mac but should be straightforward enough to
do the same on Windows:
http://bob.ippoli.to/archives/2013/01/11/getting-started-with-haskell/#install-cabal-dev



On Tue, Feb 12, 2013 at 2:45 AM, David Turner <d.turner at tracsis.com> wrote:

> Hi,
>
> From a clean install of Haskell Platform 2012.4.0.0 (on Windows) I have
> issued just:
>
> > cabal update
> > cabal install cabal-install
> > cabal install cabal-dev
>
> The last command fails with:
>
> Resolving dependencies...
> In order, the following would be installed:
> tar-0.3.2.0 (new package)
> transformers-0.2.2.0 (new version)
> mtl-2.0.1.0 (new version)
> parsec-3.1.3 (reinstall) changes: mtl-2.1.2 -> 2.0.1.0
> network-2.3.2.0 (new version)
> HTTP-4000.2.8 (new version)
> cabal-dev-0.9.1 (new package)
> cabal: The following packages are likely to be broken by the reinstalls:
> network-2.3.1.0
> haskell-platform-2012.4.0.0
> cgi-3001.1.7.4
> HTTP-4000.2.5
> Use --force-reinstalls if you want to install anyway.
>
>
> I *think* the problem is that cabal-dev has these dependencies:
>
>       mtl >= 1.1 && < 2.1,
>       transformers >= 0.2 && < 0.3,
>
> where the latest version of mtl and transformers are 2.1.2 and 0.3
> respectively. At least, if I download the latest cabal-dev package and
> relax those upper bounds I can get it to install.
>
> The irony is, of course, that I'm trying to install cabal-dev to get me
> out of a totally unrelated dependencies hole!
>
> What should I do now?
>
> Cheers,
>
> --
> David Turner
> Senior Consultant
> Tracsis PLC
>
> Tracsis PLC is a company registered in
> England and Wales with number 5019106.
>
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