{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs-master.url = "github:NixOS/nixpkgs/master";
    home-manager = {
      url = "github:nix-community/home-manager/master";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };
  #inputs.agenix.url = "github:ryantm/agenix";
  inputs.firefox-addons.url = "gitlab:rycee/nur-expressions?dir=pkgs/firefox-addons";
  inputs.nixos-hardware.url = "github:NixOS/nixos-hardware/master";
  inputs.nixvim = {
    # If you are not running an unstable channel of nixpkgs, select the corresponding branch of nixvim.
    #url = "github:nix-community/nixvim/22b587f3dc5c040eb1916aa2a67868f1918d9d17";
    url = "github:nix-community/nixvim";

    inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = inputs @ {
    self,
    nixpkgs,
    nixpkgs-master,
    firefox-addons,
    home-manager,
    nixos-hardware,
    nixvim,
    ...
  }: let
    lib = nixpkgs.lib;
    util = (import ./overlays/util.nix {} {}).util;
    system = "x86_64-linux";
    pkgs = import nixpkgs {
      inherit system;
      overlays = util.nixFilesIn ./overlays;
    };
  in {
    nixosConfigurations = {
      #pkgs.util.mapHostAttrs (host: host) (host:
      #      lib.nixosSystem {
      #        system = "x86_64-linux";
      #        modules = [./hosts/x86_64-linux/${host}];
      #        specialArgs = {inherit inputs;};
      #      });
      "asmodeus" = lib.nixosSystem {
        system = "x86_64-linux";
        modules = [./hosts/x86_64-linux/asmodeus];
        specialArgs = {inherit inputs;};
      };
      "seraphim" = lib.nixosSystem {
        system = "x86_64-linux";
        modules = [./hosts/x86_64-linux/seraphim];
        specialArgs = {inherit inputs;};
      };
      "lilith" = lib.nixosSystem {
        system = "x86_64-linux";
        modules = [./hosts/x86_64-linux/lilith];
        specialArgs = {inherit inputs;};
      };
      "lambda" = lib.nixosSystem {
        system = "x86_64-linux";
        modules = [./hosts/x86_64-linux/lambda];
        specialArgs = {inherit inputs;};
      };
      "alastor" = lib.nixosSystem {
        system = "aarch64-linux";
        modules = [./hosts/aarch64-linux/alastor];
        specialArgs = {inherit inputs;};
      };
    };

    formatter = {
      x86_64-linux = inputs.nixpkgs.legacyPackages.x86_64-linux.alejandra;
      aarch64-linux = inputs.nixpkgs.legacyPackages.aarch64-linux.alejandra;
    };
  };
}