{
  description = "A Nix-flake-based Shell development environment";

  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11"; # unstable Nixpkgs

  outputs = {self, ...} @ inputs: let
    supportedSystems = [
      "x86_64-linux"
      "aarch64-linux"
      "x86_64-darwin"
      "aarch64-darwin"
    ];
    forEachSupportedSystem = f:
      inputs.nixpkgs.lib.genAttrs supportedSystems (
        system:
          f {
            pkgs = import inputs.nixpkgs {inherit system;};
          }
      );
  in {
    devShells = forEachSupportedSystem (
      {pkgs}: {
        default = pkgs.mkShellNoCC {
          packages = with pkgs; [
            shellcheck
            (sbcl.withPackages (ps: [ps.str]))
          ];
        };
      }
    );
  };
}