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List:       haskell-cafe
Subject:    Re: [Haskell-cafe] Cabal problem, broken packages?
From:       Volker Wysk <post () volker-wysk ! de>
Date:       2022-09-16 8:20:55
Message-ID: 0c728cb3b076e933dd55e10ed01f8352b5d156c4.camel () volker-wysk ! de
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Am Freitag, dem 16.09.2022 um 08:38 +0100 schrieb Tom Ellis:
> On Thu, Sep 15, 2022 at 05:33:06PM +0100, Tom Ellis wrote:
> > On Thu, Sep 15, 2022 at 06:09:33PM +0200, Volker Wysk wrote:
> > > Am Donnerstag, dem 15.09.2022 um 17:47 +0200 schrieb Mikolaj Konarski:
> > > > This may be caused by some cabal.project lying around
> > > > (e.g., in the directory you are in when you are installing, but also
> > > > in any parent directory) or by .ghc.environment.arch-os-version
> > > > files lying around
> > > > 
> > > > https://ghc.gitlab.haskell.org/ghc/doc/users_guide/packages.html#package-environments
> > > 
> > > I don't have a cabal.project or  .ghc.environment.arch-os-version lying
> > > around. However, I've found ~/.ghc/x86_64-linux-8.8.4/environments/default,
> > > which contains this:
> > 
> > GHC 8.8.4 depends on directory 1.3.6.0, therefore the GHC API package,
> > ghc, does too as mentioned in the original error message:
> > 
> > 
> > [__1] rejecting: ghc-8.8.4/installed-8.8... (conflict: directory==1.3.7.1, ghc
> > => directory==1.3.6.0/installed-1.3...)
> > 
> > 
> > and can be verified at:
> > 
> > https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/libraries/version-history
> > 
> > 
> > However, you have got an environment file that requires ghc-8.8.4 and
> > directory-1.3.7.1 at the same time.  Something's funny about that
> > because it's impossible to satisfy and I'm not sure how it could have
> > happened in the first place.  Perhaps some cabal expert can weigh in.
> 
> In the hope that a cabal expert can explain this behaviour I have
> opened as issue:
> 
> https://github.com/haskell/cabal/issues/8473

Thanks for that. But I'm switching to cabal ("cabal build") now, instead of
my Makefile. Of course the problem should be minded, if it is a bug.
However, I don't need that any longer.

Cheers,
Volker
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