stack build error: attribute ‘ghc822’ missing, at (string):1:53

Question

I am attempting to build my haskell project on NixOS.

Running $ stack build gives the following error.

$ stack build
error: attribute ‘ghc82         


        

Answer 1

Another option is to use a shell.nix. nixos-18.03 comes with ghc 8.2.2, so you can create a shell.nix like:

with import (builtins.fetchGit {
    url = https://github.com/NixOS/nixpkgs-channels;
    ref = "nixos-18.03";
    rev = "cb0e20d6db96fe09a501076c7a2c265359982814";
}) {};

haskell.lib.buildStackProject {
    name = "my-project";
    buildInputs = [ ghc  ];
}

And add the following to your stack.yaml:

nix:
  shell-file: shell.nix

Then stack build as usual.