{
  description = "Build my xmonad config";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

  outputs = {
    self,
    nixpkgs,
  }: let
    forAllSystems = function:
      nixpkgs.lib.genAttrs ["x86_64-linux" "aarch64-linux"] (system:
        function rec {
          inherit system;
          compilerVersion = "ghc966";
          pkgs = nixpkgs.legacyPackages.${system};
          hsPkgs = pkgs.haskell.packages.${compilerVersion}.override {
            overrides = hfinal: hprev: {
              # Internal Packages
              xmonad-config = hfinal.callCabal2nix "xmonad-config" ./. {};
              xmonad = hprev.xmonad_0_18_0;
              xmonad-contrib = hprev.xmonad-contrib_0_18_1;
            };
          };
        });
  in {
    formatter = forAllSystems ({pkgs, ...}: pkgs.alejandra);
    packages = forAllSystems ({hsPkgs, ...}: {
      default = hsPkgs.xmonad-config;
    });
    devShells = forAllSystems ({
      hsPkgs,
      pkgs,
      ...
    }: {
      default = hsPkgs.shellFor {
        name = "xmonad-config";
        packages = p: [
          p.xmonad-config
        ];
        buildInputs = with pkgs; [
          hsPkgs.haskell-language-server
          hsPkgs.cabal-install
          cabal2nix
          haskellPackages.ghcid
        ];
      };
    });
  };
}