{
  description = "Dev shell and builder for tonybtw.com (Makefile + pandoc)";

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

  outputs = { self, nixpkgs, ... }:
    let
      systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
      foreach = f: builtins.listToAttrs (map (system: { name = system; value = f system; }) systems);
      toolsFor = pkgs: [
        pkgs.gnumake pkgs.pandoc pkgs.coreutils pkgs.gnused pkgs.gawk
        pkgs.findutils pkgs.python3 pkgs.bash
      ];
    in
    {
      packages = foreach (system:
        let pkgs = import nixpkgs { inherit system; }; in
        {
          default = pkgs.stdenvNoCC.mkDerivation {
            name = "tonybtw.com";
            src = ./.;
            nativeBuildInputs = toolsFor pkgs;
            buildPhase = "make site";
            installPhase = ''
              mkdir -p $out
              cp -r public/. $out/
            '';
          };
        });

      devShells = foreach (system:
        let pkgs = import nixpkgs { inherit system; }; in
        {
          default = pkgs.mkShell {
            packages = toolsFor pkgs ++ [ pkgs.woff2 ];
            shellHook = ''
              export PS1="(tonybtw-dev) $PS1"
              echo "build:  make"
              echo "serve:  make serve   (http://localhost:1313)"
            '';
          };
        });
    };
}