[Haskell-beginners] problem installing persistent-postgresql together with persistent-template

[Michael Snoyman]

You can force this with cabal using --constraint
"persistent-template=2.2.2" or the equivalent.

But these kinds of dependency solving problems are the primary reason I
recommend using a Stackage snapshot[1]. If you switch over to building with
Stack[2], you'll get that behavior by default.

[1] https://www.stackage.org/
[2] http://haskellstack.org/

On Wed, Mar 2, 2016 at 12:04 PM, Miro Karpis <miroslav.karpis at gmail.com>
wrote:

> Please,..can you help me with following?
>
> I'm trying to install both persistent-postgresql together with
> persistent-template, but I keep getting:
>
>
> mac:~ miro$ cabal install persistent-template
> Resolving dependencies...
> In order, the following would be installed:
> aeson-0.9.0.1 (latest: 0.11.0.0) (via: persistent-template-2.1.5
> persistent-2.2.4 aeson-compat-0.3.1.0) (new version)
> aeson-compat-0.3.1.0 (via: persistent-template-2.1.5) (new package)
> persistent-2.2.4 (via: persistent-template-2.1.5) (reinstall) (changes:
> aeson-0.11.0.0 -> 0.9.0.1)
> persistent-template-2.1.5 (new package)
> cabal: The following packages are likely to be broken by the reinstalls:
> persistent-postgresql-2.2.2
> Use --force-reinstalls if you want to install anyway.
>
>
>
> If I continue with force-reinstall then I broke postgresql. Is there a way
> to force persistent-template to use 2.2.2 version (I know if I download it
> and change the dep. in cabal file,....but is that what I should do :) )?
>
>
>
> running on:
> mac:~ miro$ cabal --version
> cabal-install version 1.22.8.0
> using version 1.22.7.0 of the Cabal library
>
> mac:~ miro$ ghc --version
> The Glorious Glasgow Haskell Compilation System, version 7.10.3
>
>
> cheers,
> m.
>
>
>
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