{
  description = "artemist's NixOS packages and shells for development";

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

  outputs =
    {
      self,
      nixpkgs,
      utils,
    }:
    utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [ self.overlays.default ];
        };
        inherit (pkgs) lib;
        names = builtins.attrNames (self.overlays.default pkgs pkgs);
      in
      {
        devShells = {
          plotter = pkgs.callPackage ./shells/plotter { };
          ryujinx = pkgs.callPackage ./shells/ryujinx { };
          zephyr = pkgs.callPackage ./shells/zephyr { };
        };

        formatter = pkgs.nixfmt-rfc-style;
        packages = builtins.listToAttrs (
          lib.concatMap (
            name:
            let
              pkg = pkgs.${name};
            in
            lib.optional (builtins.typeOf pkg == "set") {
              inherit name;
              value =
                if lib.isDerivation pkg then
                  pkg
                else
                  pkg
                  // {
                    type = "derivation";
                    name = "dummy-attrset";
                  };
            }
          ) names
        );
      }
    )
    // {
      overlays.default = final: prev: {
        attic = final.callPackage ./packages/attic { };
        attic-client = final.attic.override { clientOnly = true; };
        cups-dymo-patched = final.callPackage ./packages/cups-dymo { };
        hactoolnet = final.callPackage ./packages/hactoolnet { };
        ipsw = final.callPackage ./packages/ipsw { };
        jlink = final.callPackage ./packages/jlink { };
        stlink-tool = final.callPackage ./packages/stlink-tool { };
        zephyrPackages = final.callPackage ./packages/zephyr { };

        inherit (final.python3.pkgs) axicli vpype;

        inkscape-extensions = prev.inkscape-extensions // {
          axidraw = final.callPackage ./packages/axidraw/inkscape.nix { };
        };

        kernelPatches = prev.kernelPatches // final.callPackage ./packages/kernelPatches { };

        pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
          (
            pythonFinal: pythonPrev:
            {
              pnoise = final.callPackage ./packages/pnoise { python3 = pythonFinal; };
              vpype = final.callPackage ./packages/vpype { python3 = pythonFinal; };
              vpype-gcode = final.callPackage ./packages/vpype-gcode { python3 = pythonFinal; };
            }
            // (final.callPackage ./packages/axidraw/modules.nix { python3 = pythonFinal; })
          )
        ];
      };
    };
}