{
  description = "forums-btw - A minimal php forum";
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
  };
  outputs = {
    self,
    nixpkgs,
  }: let
    systems = ["x86_64-linux" "aarch64-linux"];

    forAllSystems = fn: nixpkgs.lib.genAttrs systems (system: fn nixpkgs.legacyPackages.${system});
  in {
    devShells = forAllSystems (pkgs: {
      default = pkgs.mkShell {
        packages = [
          (pkgs.php.withExtensions ({enabled, all}: enabled ++ [all.pdo_sqlite]))
          pkgs.just
          pkgs.sqlite
        ];
        shellHook = ''
          export PS1="(forums-btw) $PS1"
          echo ""
          echo "  forums-btw dev server"
          echo "  ---------------------"
          echo "  just dev         - start php server on localhost:8889"
          echo "  just dev 3000    - start on custom port"
          echo ""
          echo "  FORUM_DB defaults to ./data/forum.db"
          echo "  just reset-db    - delete the local database"
          echo ""
        '';
      };
    });

    formatter = forAllSystems (pkgs: pkgs.alejandra);
  };
}