{
  description = "personal NixOS configurations";

  inputs = {
    # Nixpkgs, NixOS's official repo
    nixpkgs.url = "github:nixos/nixpkgs/release-22.05";

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

    # We use the unstable nixpkgs repo for some packages.
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixpkgs-unstable";

    emacs-overlay.url = "github:nix-community/emacs-overlay";

    agenix = {
      url = "github:ryantm/agenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    nur.url = "github:nix-community/NUR";

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

    home-manager = {
      url = "github:nix-community/home-manager/release-22.05";
      # We want home-manager to use the same set of nixpkgs as our system.
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  # Output config, or config for NixOS system
  outputs = { ... }@inputs:
    let lib = import ./nix { inherit inputs; };
    in {
      nixosConfigurations = {
        carmel = lib.mkSystem { hostname = "carmel"; };
        aptos = lib.mkSystem { hostname = "aptos"; };
        tahoe = lib.mkSystem { hostname = "tahoe"; };
      };
    } // inputs.utils.lib.eachDefaultSystem (system:
      let
        pkgs = import inputs.nixpkgs { inherit system; };
        home-manager = inputs.home-manager.defaultPackage."${system}";
      in {
        packages = pkgs // {
          inherit home-manager;

          tools = {
            dnsupdate = import ./tools/dnsupdate { inherit pkgs; };
            govanity = import ./tools/govanity { inherit pkgs; };
          };

          users.fcuny = {
            blog = import ./users/fcuny/blog { inherit pkgs; };
            notes = import ./users/fcuny/notes { inherit pkgs; };
            resume = import ./users/fcuny/resume { inherit pkgs; };
          };
        };

        devShell = pkgs.mkShell {
          buildInputs = with pkgs; [
            nixUnstable
            nixfmt
            rnix-lsp
            home-manager
            git
            go
            gopls
          ];
        };
      });
}