{
  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 ];
        };
      in {
        devShells = { zephyr = pkgs.callPackage ./shells/zephyr { }; };

        formatter = pkgs.nixfmt;
        packages = self.overlays.default pkgs pkgs;
      }) // {
        overlays.default = final: prev: {
          jlink = final.callPackage ./packages/jlink { };
          kernelPatches = final.callPackage ./packages/kernelPatches { };
          zephyrPackages = final.callPackage ./packages/zephyr { };
        };
      };
}