{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    systems.url = "github:nix-systems/default-linux";

    cl-hyprland-ipc = {
      url = "github:eriedaberrie/cl-hyprland-ipc";
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.systems.follows = "systems";
    };
  };

  outputs = {
    self,
    nixpkgs,
    systems,
    cl-hyprland-ipc,
  }: let
    inherit (nixpkgs) lib;
    forSystems = f:
      lib.genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});
  in {
    overlays = {
      default = _: prev: {
        sync-music = prev.callPackage ./nix/sync-music.nix {};

        time-window = prev.callPackage ./nix/time-window.nix {
          inherit (cl-hyprland-ipc.packages.${prev.stdenv.system}) cl-hyprland-ipc;
        };
      };
    };

    packages = forSystems (self.overlays.default null);

    devShells = forSystems (
      pkgs: {
        default = pkgs.mkShell rec {
          inputsFrom = builtins.attrValues self.packages.${pkgs.stdenv.system};

          nativeBuildInputs =
            [
              (pkgs.sbcl.withPackages (lib.const
                (lib.concatMap (p: p.lispLibs) inputsFrom)))
            ]
            ++ lib.concatMap (p: p.runtimeInputs or []) inputsFrom;

          LD_LIBRARY_PATH = let
            getNativeLibs = d:
              d.nativeLibs
                or []
              ++ builtins.concatMap getNativeLibs (d.lispLibs or []);
          in lib.makeLibraryPath (lib.lists.unique (builtins.concatMap getNativeLibs inputsFrom));
        };
      }
    );

    formatter = forSystems (pkgs: pkgs.alejandra);
  };
}