{
  description = "A very basic flake";

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

  outputs = { self, nixpkgs }:
  let
    systems = [
      "x86_64-linux"
    ];
    forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
  in {
    devShells = forAllSystems (system: {
      default = nixpkgs.legacyPackages.${system}.callPackage ./shell.nix { };
    });
  };
}