{ ghc, nixpkgs ? import ./nixpkgs.nix }:

let
  # haskellPackages = import ./stackage.nix { inherit nixpkgs; };
  haskellPackages = pkgs.haskellPackages;
  inherit (nixpkgs {}) pkgs;
in pkgs.haskell.lib.buildStackProject {
  inherit ghc;
  inherit (haskellPackages) stack;
  name = "stackenv";
  buildInputs = (with pkgs;
    [ # postgresql zlib libsodium gmp llvm_9
    ]) ++ (with haskellPackages;
    [ # yesod-bin happy alex
    ]);
}