{
  description = "my project description";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = inputs@{self, nixpkgs, flake-utils, ...}:
  flake-utils.lib.eachDefaultSystem (system:
  let
    pkgs = import nixpkgs {
      inherit system;
      crossSystem = nixpkgs.lib.systems.examples.aarch64-multiplatform;
    };
  in
  {
    packages = let 
      orange = import ./sd-card.nix { inherit pkgs; };
    in
    {
      default = orange;
    };
  }
  );
}