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

  outputs =
    { self, nixpkgs }:
    let
      forAllSystems =
        f:
        nixpkgs.lib.genAttrs [ "x86_64-linux" "aarch64-linux" ] (
          system: f (import nixpkgs { inherit system; }) system
        );
    in
    {
      devShells = forAllSystems (
        pkgs: sys: {
          default = pkgs.mkShell {
            packages = with pkgs.ocamlPackages; [
              dune_3
              ocaml
              angstrom
              angstrom-unix
              ppx_inline_test
              ocaml-lsp
              ocamlformat
              ocamlformat-rpc-lib
              utop
            ];
          };
        }
      );
    };
}