{
  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    ocaml.url = "github:nix-ocaml/nix-overlays";
    ocaml.inputs.nixpkgs.follows = "nixpkgs";
    # it's broken wtf
    # lsp.url = "github:ocaml/ocaml-lsp";
    # lsp.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = {
    self,
    nixpkgs,
    ocaml,
    flake-utils,
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [
          ocaml.overlays.default
          (final: prev: {
            # This ensures we consistently use one version of ocaml packages
            ocamlPackages = prev.ocaml-ng.ocamlPackages_5_3;
            ocaml = prev.ocaml-ng.ocamlPackages_5_3.ocaml;
          })
        ];
      };

      # https://github.com/ahrefs/ocaml-murmur3.git
      murmur = pkgs.ocamlPackages.buildDunePackage {
        pname = "murmur3";
        version = "0.4";
        src = pkgs.fetchFromGitHub {
          owner = "polwex";
          repo = "ocaml-murmur3";
          rev = "be8ef049b515ccc1adc7393975e0f4a12a95dcb0";
          sha256 = "oojBUIo8YIzVxAau4jwToYinemuDKYwaX+2OaZ28mW0=";
        };
      };
    in {
      devShells.default = pkgs.mkShell rec {
        buildInputs =
          nativeBuildInputs
          ++ (with pkgs.ocamlPackages; [utop]);
        nativeBuildInputs = with pkgs.ocamlPackages; [
          pkgs.zig_0_14
          pkgs.sqlite
          pkgs.dune_3
          pkgs.ocaml
          (pkgs.python312.withPackages (py: [py.requests]))

          pkgs.opam
          findlib
          ocamlformat
          #
          zarith
          cmdliner
          logs
          alcotest
          qcheck
          qcheck-alcotest
          landmarks

          ctypes
          ctypes-foreign
          #
          ocaml-lsp
          eio_main
          lmdb
          domainslib
          # http server
          piaf
          murmur
        ];
      };
    });
}