flake.nix

{
  inputs = {
      nixpkgs.url = "nixpkgs/nixpkgs-unstable";

      mobile-nixos.url = "github:archseer/mobile-nixos/flake";
  };

  description = "A very basic mobile config flake";

  outputs = inputs@{ self, nixpkgs, mobile-nixos, ... }: {
    nixosConfigurations = {
      pine = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        specialArgs = { inherit mobile-nixos; };
        modules = [
          mobile-nixos.nixosModules.pine64-pinephone
        ];
      };
    };
  };
}

workaround-flake.nix

{
  inputs = {
      nixpkgs.url = "nixpkgs/nixpkgs-unstable";

      mobile-nixos.url = "github:archseer/mobile-nixos/flake";
  };

  description = "A very basic mobile config flake";

  outputs = inputs@{ self, nixpkgs, mobile-nixos, ... }:
  let 
    pkgs = import nixpkgs { system = "x86_64-linux"; };
  in
  {
    nixosConfigurations = {
      pine = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";

        specialArgs = { _mobile-nixos = {
          evalConfig = args:
            import "${toString pkgs.path}/nixos/lib/eval-config.nix" (args // { system = "x86_64-linux"; });
        }; };

        modules = [
          mobile-nixos.nixosModules.pine64-pinephone
        ];
      };
    };
  };
}

nix build ".#nixosConfigurations.pine.config.system.build.disk-image" --show-trace