[Haskell-beginners] cabal install snap-server-0.9.5.1: At least the following dependencies are missing: attoparsec >=0.10 && <0.13 && ==0.13.0.1

[Vlatko Basic]

Most of such problems can be solved with LTS (Long Term Support) from Stackage.

https://www.stackage.org/

Take a look.


-------- Original Message  --------
Subject: [Haskell-beginners] cabal install snap-server-0.9.5.1: At least the 
following dependencies are missing: attoparsec >=0.10 && <0.13 && ==0.13.0.1
From: Stanislaw Findeisen <stf.list.haskell at eisenbits.com>
To: beginners at haskell.org
Date: 10/07/15 13:49

> Hi
>
> Could anyone explain this to me, please?
>
> $ cabal install snap-server-0.9.5.1
> Resolving dependencies...
> Configuring snap-server-0.9.5.1...
> cabal: At least the following dependencies are missing:
> attoparsec >=0.10 && <0.13 && ==0.13.0.1
> cabal: Error: some packages failed to install:
> snap-server-0.9.5.1 failed during the configure step. The exception was:
> ExitFailure 1
>
> Where does this unsatisfiable dependency come from? snap-server-0.9.5.1
> seems to require just attoparsec (>=0.10 && <0.14):
> http://hackage.haskell.org/package/snap-server-0.9.5.1 . And attoparsec
> 0.13.0.1 is already installed:
>
> $ cabal list --installed attoparsec
> * attoparsec
>      Synopsis: Fast combinator parsing for bytestrings and text
>      Default available version: 0.13.0.1
>      Installed versions: 0.13.0.1
>      Homepage: https://github.com/bos/attoparsec
>      License:  BSD3
>
> * attoparsec-enumerator
>      Synopsis: Pass input from an enumerator to an Attoparsec parser.
>      Default available version: 0.3.4
>      Installed versions: 0.3.4
>      Homepage: https://john-millikin.com/software/attoparsec-enumerator/
>      License:  MIT
>
> I am trying to install hakyll 4.6.*, and snap-server seems to be one of
> the requirements. Hakyll 4.6.* is an old version but AFAIR I need that
> due to conflicting versions of containers.
>
> Thanks!
>
>
>
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