{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    systems.url = "github:nix-systems/x86_64-linux";
    flake-utils = {
      url = "github:numtide/flake-utils";
      inputs.systems.follows = "systems";
    };
  };
  outputs =
    { flake-utils
    , nixpkgs
    , ...
    }:
    flake-utils.lib.eachDefaultSystem (system:
    let
      pkgs = import nixpkgs {
        inherit system;
      };
      pkg = pkgs.callPackage ./. { };
      shell = pkgs.callPackage ./shell.nix { inherit pkg; };
    in
    {
      devShells.default = shell;
      packages.default = pkg;
    });
}