{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    berberman = {
      url = "github:berberman/flakes";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    hosts = {
      url = "github:StevenBlack/hosts";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    hyprland = {
      url = "github:hyprwm/Hyprland";
      inputs.nixpkgs.follows = "nixpkgs"; # MESA/OpenGL HW workaround
    };
    lanzaboote = {
      url = "github:nix-community/lanzaboote";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nix-darwin = {
      url = "github:LnL7/nix-darwin";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    #nixos-hardware = {
    #  url = "github:NixOS/nixos-hardware/master";
    #  #inputs.nixpkgs.follows = "nixpkgs";
    #};
    #nixpak = {
    #  url = "github:nixpak/nixpak";
    #  inputs.nixpkgs.follows = "nixpkgs";
    #};
    sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, berberman, home-manager, hosts, hyprland, lanzaboote, nix-darwin, sops-nix, ... } @ inputs: {
    darwinConfigurations = {
      "iMac-macOS" = nix-darwin.lib.darwinSystem {
        system = "x86_64-darwin";
        modules = [
          ./darwin
          ./machines/darwin/imac-2017.nix
          ./users/guanranwang/darwin.nix
          ./flakes/darwin/home-manager.nix
        ];
      };
    };




    nixosConfigurations = {
      "81fw-nixos" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        specialArgs = { inherit inputs; };
        modules = [
          ./nixos # Entrypoint
          ./machines/nixos/81fw-lenovo-legion-y7000.nix
          ./users/guanranwang/nixos.nix
          ./flakes/nixos/berberman.nix
          ./flakes/nixos/home-manager.nix
          ./flakes/nixos/hosts.nix
          ./flakes/nixos/lanzaboote.nix
          ./flakes/nixos/sops-nix.nix
        ];
      };

      # Currently un-used.
      "imac-nixos" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        specialArgs = { inherit inputs; };
        modules = [
          ./nixos
          ./machines/nixos/imac-2017.nix
          ./users/guanranwag/nixos.nix
          ./flakes/nixos/berberman.nix
          ./flakes/nixos/home-manager.nix
          ./flakes/nixos/hosts.nix
          ./flakes/nixos/lanzaboote.nix
          ./flakes/nixos/sops-nix.nix
        ];
      };
    };



    # Home-Manager
    homeConfigurations = {
      "guanranwang@81fw-nixos" = home-manager.lib.homeManagerConfiguration {
        pkgs = nixpkgs.legacyPackages.x86_64-linux;
        extraSpecialArgs = { inherit inputs; };
        modules = [
          sops-nix.homeManagerModules.sops

          hyprland.homeManagerModules.default
          {
            wayland.windowManager.hyprland = {
              enable = true;
              #enableNvidiaPatches = true;
              xwayland = {
                enable = true;
              };
            };
          }
        ];
      };

      "guanranwang@imac-nixos" = home-manager.lib.homeManagerConfiguration {
        pkgs = nixpkgs.legacyPackages.x86_64-linux;
        extraSpecialArgs = { inherit inputs; };
        modules = [
          sops-nix.homeManagerModules.sops

          hyprland.homeManagerModules.default
          {
            wayland.windowManager.hyprland = {
              enable = true;
              #enableNvidiaPatches = true;
              xwayland = {
                enable = true;
              };
            };
          }
        ];
      };
    };
  };
}