I think the answer is because we're still figuring out the best way to package Haskell programs and libraries, and Haskell tools (ghc, cabal) already have their own package-like-but-not-really systems for dealing with packages, which are difficult to cooperate with.

I wonder if anyone has tried NixOS and whether the situation is better there?

I know on many distros (including Arch!) a lot of people give up and use the Haskell tools exclusively and avoid distro package management for Haskell stuff.
But that is not a good solution in the long run, because cabal is explicitly not a package manager: it doesn't know how to remove stuff cleanly and never will, amongst other problems.

On Mon, Oct 15, 2012 at 11:00 AM, Thomas Friedrich <info@suud.de> wrote:
2012/10/13 Fabio Riga <rifabio@gmail.com>:
> 2012/10/13 Ramana Kumar <ramana@member.fsf.org>
>>
>> I'm not sure why that error happened but it happened to me too.
>
> The problem seems to be that those files were not part of any package,
> but now are in ghc.
>
>> I removed the offending files manually and tried again, and ran into more problems (although everything installed, there were many warnings about interface files being the wrong version and being skipped).
>> So I'm not sure what the correct way out is. Perhaps it will require some manual removals then reinstalls.
>
> This is a problem with ghc-pkg version. For previous version of ghc I had to do:
>
>   $ pacman -Rcs ghc
>
> then reinstall ghc and needed haskell-* packages. I think you'll want
> to remove the offending files before installing ghc again. I hope this
> solve the problem.
>
> Fabio
>


Why is it that every single time there is a ghc-update, I have to
remove everything and reinstall everything haskell related. Haskell is
such a cool language but keeping a Haskell environment up-to-date is
sometimes just a real pain.

Sorry for the rant.
Thomas

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