{
  inputs = {
    fenix = {
      url = "github:nix-community/fenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, fenix }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [ fenix.overlays.default ];
        };

        toolchain = pkgs.fenix.stable;

        flakePkgs = { markout = pkgs.callPackage ./. { inherit toolchain; }; };
      in rec {
        packages = flake-utils.lib.flattenTree flakePkgs;
        defaultPackage = packages.markout;

        devShell = pkgs.mkShell {
          inputsFrom = with packages; [ markout ];
          packages = (with pkgs; [ cargo-watch cargo-deny cargo-edit ])
            ++ (with toolchain; [ cargo rustc rustfmt clippy ]);
        };
      });
}