[Nix-dev] unable to expose libraries internal to GHC?

[Raahul Kumar]

Corey, would you mind posting your working vesion? If you can actually
build GHC 7.8, I would be very interested!

Aloha,
RK.


On Wed, Apr 16, 2014 at 3:07 AM, Corey O'Connor <coreyoconnor at gmail.com>wrote:

> Thanks for the help Peter.
>
> I tried using ghcWithPackagesOld and, in this case, that worked fine. Cool!
>
> This bug is unfortunate. I was pretty happy to see terminfo bundled with
> GHC. This meant the hardest part of installing vty, installing terminfo,
> would already be done in 7.8. Darn, no such luck.
>
> Cheers,
> Corey
>
> -Corey O'Connor
> coreyoconnor at gmail.com
> http://corebotllc.com/
>
>
> On Mon, Apr 14, 2014 at 5:25 AM, Peter Simons <simons at cryp.to> wrote:
>
>> Hi Corey
>>
>> GHC 7.8.x installs a copy of xhtml, but it doesn't make that library
>> visible to users.
>>
>> This choice causes us serious trouble that we cannot easily resolve: we
>> can't install your own copy of xhtml, because it collides with GHC's
>> copy (as you have found out). Yet, we cannot access GHC's copy either,
>> so we *need* to install our own version. Duh!
>>
>> I've opened a ticket [1] for this issue a while ago, but GHC HQ hasn't
>> addressed it yet (probably because I didn't do a good job explaining why
>> this is issue is significant).
>>
>> Anyway, you can use 'ghcWithPackagesOld' instead of 'ghcWithPackages' to
>> create your environment. ghcWithPackagesOld simply ignores all
>> collisions and chose a "random" version of the colliding paths to
>> include in the derivation. This sucks from an aesthetics point of view,
>> but it's probably going to work fine.
>>
>> I hope this helps,
>> Peter
>>
>>
>> [1] https://ghc.haskell.org/trac/ghc/ticket/8919
>>
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>
>
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