{
  description = "att_wm - a dwm-like window manager for the river Wayland compositor";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs =
    {
      self,
      nixpkgs,
      flake-utils,
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in
      {
        packages = rec {
          att_wm = pkgs.callPackage ./nix/package.nix {
            inherit self;
            zig = pkgs.zig_0_16;
          };
          default = att_wm;
        };

        devShells.default = pkgs.mkShell {
          strictDeps = false;
          nativeBuildInputs = with pkgs; [
            zig_0_16
            zls
            pkg-config
            wayland-scanner
          ];
          buildInputs = with pkgs; [
            wayland
            wayland-protocols
            libxkbcommon
          ];
          packages = with pkgs; [
            river
            quickshell
            zon2nix
          ];
        };

        formatter = pkgs.nixfmt-rfc-style;
      }
    )
    // {
      overlays.default = final: prev: {
        att_wm = final.callPackage ./nix/package.nix {
          inherit self;
          zig = final.zig_0_16;
        };
      };

      # `homeModules` is the name nix recognises; the older spelling is kept
      # so existing configs importing it keep working.
      homeModules.default = import ./nix/hm-module.nix self;
      homeManagerModules.default = import ./nix/hm-module.nix self;
    };
}