{
  description = "slides for talks";

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

  outputs = { self, nixpkgs, flake-utils }:
    (flake-utils.lib.eachDefaultSystem
      (system:
        let
          pkgs = import nixpkgs { inherit system; };
        in
        {
          formatter = pkgs.nixpkgs-fmt;
          devShells.default = pkgs.mkShell {
            packages = with pkgs; [
              gnumake
              marp-cli
            ];
          };
        })
    );
}