{
  description = "KutuWM X11";

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

  outputs =
    { self, nixpkgs }:
    let
      systems = [
        "x86_64-linux"
        "x86_64-darwin"
        "aarch64-linux"
        "aarch64-darwin"
      ];

      forAllSystems =
        f:
        nixpkgs.lib.genAttrs systems (
          system:
          f (
            import nixpkgs {
              inherit system;
            }
          )
        );
    in
    {
      devShells = forAllSystems (pkgs: {
        default = pkgs.mkShell {
          packages = with pkgs; [
            clang-tools
            clang

            gnumake
            ruby

            haskellPackages.ghc
            haskellPackages.cabal-install
            haskellPackages.haskell-language-server

            pkg-config

            libxcb
            xcbutilwm
          ];

          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
            pkgs.libxcb
            pkgs.xcbutilwm
          ];

          shellHook = ''
            export CC=clang
            export CXX=clang++
            export LD=clang
            cabal --version
            ghc --version
          '';
        };
      });
    };
}