[Nix-dev] ghc-mod depends on Wayland

[Mathijs Kwik]

ghc-mod should not have a runtime dependency on emacs at all.

At build-time, emacs-nox sounds fine indeed.



Andreas Herrmann <andreash87 at gmx.ch> writes:

> Hello everyone,
>
> Recently, I tried to install the ghc-mod package. I was surprised to
> see that nix-env intended to install a _large_ amount of dependencies
> down to quite unexpected ones such as Wayland.
>
> I dug into the dependency tree:
>
>     nix-store -qR --tree $(nix-instantiate -A haskellPackages.ghcMod '<nixpkgs>')
>
>     /nix/store/0b7bmyslyidn7iq7bcmxzgxqa0wcd786-haskell-ghc-mod-ghc7.8.3-5.1.1.0-shared.drv
>     +---/nix/store/gzgrizf2xw537hnnbycbnpbxzrwddxjw-emacs-24.4.drv
>     |   +---/nix/store/lp9z54f5snvrdnvlih815m28lxb5080l-librsvg-2.36.4.drv
>     |   |   +---/nix/store/l89khlm6piiilivpnx618w13cfqqj223-cairo-1.12.16.drv
>     |   |   |   +---/nix/store/ib90dbdwvijmv44v7ij7ghs1md5nfrf2-mesa-noglu-10.2.6.drv
>     |   |   |   |   +---/nix/store/gl09hmxv11fvsz2dkr6s6i5xsbvp2c55-wayland-1.6.0.drv
>
>
> As it turns out this comes from Emacs and the problem is fixed with a simple package override:
>
>     { pkgs }: {
>       packageOverrides = self: with pkgs; {
>         emacs = self.emacs.override { withX = false; withGTK = false; };
>       }
>     }
>
>
> However, I'm wondering if this really is the intended default behavior for that package. Wouldn't it be better to have ghc-mod depend on a nox-emacs by default?
>
> Best, Andreas
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