[Haskell-cafe] Cabal dependencies

[José Lopes]

OK.

But, wouldn't it be possible for xmobar to use mtl-2.0.1.0 and for 
parsec to use mtl-2.1.1, while xmobar would use this parsec version?
In this case, I am assuming that mtl-2.0.1.0 and mtl-2.1.1 are 
considered two different libraries.

Thanks,
José

On 06-10-2012 17:17, Yuras Shumovich wrote:
> On Sat, 2012-10-06 at 17:02 +0200, José Lopes wrote:
>> Hello,
> Hello
>> I'm trying to understand Cabal dependencies.
>> Why does the following situation happen?
> xmobar-0.15 depends on mtl-2.0.* and needs parsec
>
> All packages that will be broken, depends on parsec.
> But parsec is compiled with mtl-2.1.1
> To install xmobar, cabal needs to reinstall parsec with mtl-2.0.1.0
>
> Thanks,
> Yuras
>
>> # cabal install xmobar --dry-run
>> Resolving dependencies...
>> In order, the following would be installed:
>> parsec-3.1.3 (reinstall) changes: mtl-2.1.1 -> 2.0.1.0
>> xmobar-0.15 (new package)
>> Warning: The following packages are likely to be broken by the reinstalls:
>> Best regards,
>> José
>>
>

-- 
José António Branquinho de Oliveira Lopes
Instituto Superior Técnico
Technical University of Lisbon