{
  description = "Custom ZeroTierOne build with private patches";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

    # Pin to specific nixpkgs version for zerotierone base package
    nixpkgs-zerotier-base = {
      url = "github:NixOS/nixpkgs/d9d87c51960050e89c79e4025082ed965e770d68"; 
      follows = "nixpkgs";
    };

    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, nixpkgs-zerotier-base, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
      in
      {
        packages = {
          zerotierone-tspu = pkgs.callPackage ./package.nix {
            zerotierone = (import nixpkgs-zerotier-base { inherit system; }).zerotierone;
          };

          default = self.packages.${system}.zerotierone-tspu;
        };

        devShells.default = import ./shell.nix {
          inherit pkgs;
        };
      }
    );
}