[Nix-dev] haskell: overriding mtl/any builtin

[Mateusz Kowalczyk]

On 09/07/2014 10:57 AM, Mateusz Kowalczyk wrote:
> On 09/07/2014 10:15 AM, Marc Weber wrote:
>>> mtl choosing versions
>> Which is the target package you want to use/work on?
>>
>> Marc Weber
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>> nix-dev at lists.science.uu.nl
>> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>>
> 
> In this case >=mtl-2.2.1 but I'd like to know the solution in general.
> As long as we could ‘cabal install whatever’ on a regular distro, I'd
> like to know how to achieve the same thing with nix.
> 

Notably if I specify mtl = mtl_2_2_1; then it complains that it needs
transformers == 0.4 but there seems to be no clues in nixpkgs as to how
to achieve this. Currently mtl = 2.2.1 for HEAD but I know it should
work with 7.8.3

-- 
Mateusz K.