[Haskell-beginners] Install mess

[Michel Haber]

Hello,
perhaps check the install repository. I had the same problem:
With an old version of ghc and cabal installed, the symlink isn't changed
to point towards the new one.
You can do so manually:
- get the dir of your ghc: $ which ghc
- the directory ends with /bin/
- in fact this would be a symlink towards a version of ghc (not the version
you want)
- simply change the symbolic link (usually the actual ghc dir is right next
to the bin symlink)

On Tue, Jan 29, 2019 at 4:37 AM Lawrence Bottorff <borgauf at gmail.com> wrote:

> So I've set up the Herbert V. Riedel PPA
>
> sudo add-apt-repository ppa:hvr/ghc
> sudo apt-get update
>
> then I installed ghc-8.6.3 and cabal-install-2.4
>
> sudo apt-get install ghc-8.6.3
> sudo apt-get install cabal-install-2.4
>
> . . . and stuff seems to be installing. However a check finds no cabal and
> ghc version 8.2.2
>
> What am I missing?
>
> LB
>
>
>
>
>
> On Mon, Jan 28, 2019 at 11:39 AM Baojun Wang <wangbj at gmail.com> wrote:
>
>> You can install `ghc` and `cabal-install` (provide the `cabal` command
>> line application) using hvr ppa, if you have a project created by `cabal`
>> or `stack`, then that's pretty much all you need (ghc+cabal-install), you
>> can run
>>
>> cabal new-update # update the local package package indexes
>> cabal new-build # to build the package
>>
>>   or use
>>
>> cabal init # to create a project
>>
>> There're other commands such as `cabal new-install, cabal new-test, cabal
>> new-run` could be quite useful, the official document can be found at:
>> https://cabal.readthedocs.io/en/latest/nix-local-build-overview.html
>>
>>  If you choose `stack` then stack can manage ghc installation by itself,
>> the stack website should have enough information to get started:
>> https://docs.haskellstack.org/en/stable/README/
>>
>> Personally I would prefer hvr ghc/cabal-install, or stack, instead of
>> ghc/cabal provided by the system, as they don't usually seems to
>> up-to-date, and cabal-install manages packages dependencies a lot better
>> with the new command line interfaces (cabal new-*).
>>
>>
>>
>> On Mon, Jan 28, 2019 at 11:29 AM Lawrence Bottorff <borgauf at gmail.com>
>> wrote:
>>
>>> So I've got the HVR ppa going, now, what specifically do I want to
>>> install, type on the command? I guess I'm hearing stack?
>>>
>>> On Sun, Jan 27, 2019 at 11:39 PM Graham Gill <math.simplex at gmail.com>
>>> wrote:
>>>
>>>> I faced a similar problem recently and wasn't able to finish building
>>>> Liquid Haskell and HIE until I started afresh. I wiped/uninstalled old
>>>> Haskell platforms, stack and cabal. Then for a system GHC and cabal I used
>>>> the HVR ppa. You could also use ghcup. See the ghcup page on github which
>>>> links to the HVR ppa also.  See the downloads page at haskell.org,
>>>> under Linux generic installer, which currently recommends using ghcup. (I
>>>> liked the flavour of the HVR ppa more so went with that. )
>>>>
>>>> For anything else I'm using the latest stack.
>>>>
>>>> I think my setup is much cleaner as a result, and tools better
>>>> organised.
>>>>
>>>> Regards,
>>>> Graham
>>>>
>>>>
>>>>
>>>> On Mon, Jan 28, 2019, 11:12 Lawrence Bottorff <borgauf at gmail.com wrote:
>>>>
>>>>> I'm on Ubuntu 18.10 and I've made a real mess of my Haskell install.
>>>>> In the past I believe I installed from source. Then I must have tried to
>>>>> install through Ubuntu's repo, then I installed through the Haskell tool
>>>>> stack (curl -sSL https://get.haskellstack.org/ | sh). Now I can type
>>>>> ghci at the command line and I get 8.4.2, through stack ghci I get version
>>>>> 8.0.1, while starting a ghci REPL in Emacs goes with the 8.4.2. The Ubuntu
>>>>> repo version seems to be 8.2.2, BTW. What can I do/what should I do to
>>>>> straighten this out? What is the definitive install of Haskell, stack or
>>>>> Haskell platform, and what role should cabal play?
>>>>>
>>>>> LB
>>>>> _______________________________________________
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>>>>>
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