Newbie: Can't understand cabal errors during install of hakyll

[Adam Bergmark]

I sent a pull request to add time 1.4.* support to hakyll:
https://github.com/jaspervdj/hakyll/pull/360

Might make it easier for <7.10 users in the future.

- Adam


On Sat, Aug 1, 2015 at 3:34 PM, Adam Bergmark <adam at bergmark.nl> wrote:

> It seems like you have time-1.4.2 installed, the latest GHC (7.10) comes
> with time 1.5.*. Are you sure you are on 7.10?
>
> The core of the problem is that hakyll needs time >= 1.5, and unix is
> using the pre-installed time-1.4.2. This is rejected because only one
> version of a library can be used in the same install plan.
>
> As the error message suggests you can you increase the backjump limit so
> I'd try that first. I typically pass --reorder-goals --max-backjumps=-1 to
> cabal-install. Running this sometimes takes a long time, but it will finish
> eventually.
>
> You can also try installing an older version of hakyll that works with
> time-1.4.2 (see the hackage page for info on older versions).
>
> Lastly,  are you using a sandbox? It also helps with reducing problems. I
> never install anything in the global or user level package db, only in
> sandboxes.
>
> HTH,
> Adam
>
>
>
> On Sat, Aug 1, 2015 at 2:36 PM, Peder Jakobsen <pjakobsen at gmail.com>
> wrote:
>
>> Hi,
>>
>> Been with Haskell just for few days, and thought it would be a good
>> exercise to run a static site generator to get familiar with various tools,
>> and I’m already running into “cabal hell” I think.  :(
>>
>>
>> $ cabal install hakyll
>> Resolving dependencies...
>> cabal: Could not resolve dependencies:
>> trying: hakyll-4.7.2.0 (user goal)
>> next goal: time (dependency of hakyll-4.7.2.0)
>> rejecting: time-1.4.2/installed-d67... (conflict: hakyll => time>=1.5 &&
>> <1.6)
>> trying: time-1.5.0.1
>> trying: process-1.2.0.0/installed-3a4... (dependency of hakyll-4.7.2.0)
>> next goal: unix (dependency of process-1.2.0.0/installed-3a4...)
>> rejecting: unix-2.7.0.1/installed-8ad... (conflict: time==1.5.0.1, unix =>
>> time==1.4.2/installed-d67...)
>> rejecting: unix-2.7.1.0, 2.7.0.1, 2.7.0.0, 2.6.0.1, 2.6.0.0, 2.5.1.1,
>> 2.5.1.0,
>> 2.5.0.0, 2.4.2.0, 2.4.1.0, 2.4.0.2, 2.4.0.1, 2.4.0.0, 2.3.2.0, 2.3.1.0,
>> 2.3.0.0, 2.2.0.0, 2.0 (conflict: process => unix==2.7.0.1/installed-8ad..
>> .)
>> Backjump limit reached (change with --max-backjumps).
>>
>>
>> I’m running OS X Yosemite 10.2.2 with all the latest versions of  Haskell
>> and cabal.
>>
>> Thanks  you for listening. :)
>>
>> Peder
>>
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>>
>>
>
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