{
  inputs.nixpkgs.url = "nixpkgs";

  outputs = { self, nixpkgs, ... }:
    let
      supportedSystems = [ "x86_64-linux" "aarch64-linux" ];
      forAllSystems' = nixpkgs.lib.genAttrs;
      forAllSystems = forAllSystems' supportedSystems;
      pkgsForSystem = system:
        nixpkgs.legacyPackages.${system}.appendOverlays [];
    in
      {
        devShells = forAllSystems (system:
          let
            pkgs = pkgsForSystem system;
            hPkgs = pkgs.haskell.packages."ghc962";
            stack-wrapper = pkgs.symlinkJoin {
              name = "stack";
              paths = [ pkgs.stack ];
              buildInputs = [ pkgs.makeWrapper ];
              postBuild = ''
                wrapProgram $out/bin/stack \
                  --add-flags "\
                    --no-nix \
                    --system-ghc \
                    --no-install-ghc \
                  "
              '';
            };
          in
          {
            default = pkgs.mkShell {
              buildInputs = [
                hPkgs.fourmolu
                hPkgs.implicit-hie
                hPkgs.haskell-language-server
                hPkgs.ghc
                stack-wrapper
                pkgs.glibcLocales
              ];
            };
          }
        );
      };
}