{
  description = "FreeBSD bootloader";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      rust-overlay,
    }:
    let
      lib = nixpkgs.lib;
      makePkgs =
        system:
        import nixpkgs {
          inherit system;
          overlays = [ rust-overlay.overlays.default ];
        };
      forAllSystems = f: lib.genAttrs lib.systems.flakeExposed (system: f (makePkgs system));
    in
    {
      formatter = forAllSystems (pkgs: pkgs.nixfmt-rfc-style);
      devShells = forAllSystems (
        pkgs:
        let
          rust-uefi = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
        in
        {
          default = pkgs.mkShell {
            packages = [ rust-uefi ];

            RUST_SRC_PATH = "${rust-uefi}/lib/rustlib/src/rust/library";
          };
        }
      );
    };
}