[Haskell-cafe] Hint & Cabal Install weirdness.

[Daniel Fischer]

Am Montag, 2. März 2009 05:24 schrieb Joseph Fredette:
> I'm attempting to install hint, I started by doing:
>
> cabal install hint
>
> and it gives me the following error:
>
> cabal: dependencies conflict: ghc-6.10.1 requires process ==1.0.1.1 however
> process-1.0.1.1 was excluded because ghc-6.10.1 requires process ==1.0.1.0
>

That seems to be *the* most frequent problem this year.

Duncan Coutts explained the matter in 
http://haskell.org/pipermail/haskell-cafe/2009-January/054523.html

Hopefully one of the process packages is in the user db, if both are in the 
global db, it might be necessary to reinstall ghc.

> So I decided to try installing it via darcs, expecting to either have it
> work, or boil it down to one or two dependencies that were causing the
> problem, my hunch was right, it boils down to the ghc-mtl package,
> leading to the same error as above. My question is, how can I fix this?
> Doing a ghc-pkg hide on either process package breaks Cabal and Haddock
> (among others) according to the error message, and even after that
> happens, cabal complains about needing ghc >= 6.6 (or 6.8, depending on
> which package I disable), even though I have ghc 6.10.
>
> Detailed system info follows, help me haskell-cafe-kenobi(s), you're
> (all) my only hope(s)!
>
> Sysinfo:
>
> Arch Linux: uname -a gives:
> Linux Erdos 2.6.28-ARCH #1 SMP PREEMPT Mon Feb 2 22:22:59 UTC 2009 i686
> Intel(R) Celeron(R) CPU 3.06GHz GenuineIntel GNU/Linux
>
> ghc --version gives:
> The Glorious Glasgow Haskell Compilation System, version 6.10.1
>
> cabal --version:
> cabal-install version 0.6.0
> using version 1.6.0.1 of the Cabal library
>
> Thanks again,
>
> /Joe