{
  description = "H2 Nix Flake";

  inputs.nix-filter.url = "github:numtide/nix-filter";
  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.nixpkgs.url = "github:anmonteiro/nix-overlays";
  inputs.nixpkgs.inputs.flake-utils.follows = "flake-utils";

  outputs = { self, nixpkgs, flake-utils, nix-filter }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages."${system}".extend (self: super: {
          ocamlPackages = super.ocaml-ng.ocamlPackages_5_2.overrideScope (oself: osuper: {
            gluten-lwt-unix = osuper.gluten-lwt-unix.overrideAttrs (o: {
              propagatedBuildInputs = o.propagatedBuildInputs ++ [ oself.tls-lwt ];
            });
          });
        });
        packages = pkgs.callPackage ./nix { nix-filter = nix-filter.lib; };
      in
      {
        packages = packages // { default = packages.h2; };
        defaultPackage = packages.h2;
        devShells = {
          default = pkgs.callPackage ./nix/shell.nix { inherit packages; };
          release = self.devShells.${system}.default.override { release-mode = true; };
        };
      });
}