Add nix dependencies to stack.yaml

[chris-martin]

This enables building on NixOS with stack --nix!

[snoyberg]

Unfortunately this change breaks non-Nix usage of wai (see the Travis build failures). How about including the changes in a commented-out section of the stack.yaml file?

[chris-martin]

Whoops, I didn't think that section would make any difference unless Nix support was explictily enabled with nix.enable or the --nix flag. Is there really no better way to do that? 😦

[snoyberg]

Maybe you can set nix.enable to false?

On Sun, Mar 13, 2016 at 8:48 AM, Chris Martin notifications@github.com
wrote:

Whoops, I didn't think that section would make any difference unless Nix
support was explictily enabled with nix.enable or the --nix flag. Is
there really no better way to do that? [image: 😦]

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#520 (comment).

[chris-martin]

Trying that, waiting on the build now.

[chris-martin]

Looks like that worked!