{
  description = "NixOS configuration";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/release-21.05";
    nixos-unstable.url = "github:nixos/nixpkgs/nixos-unstable";

    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";

    easy-dhall-nix.url = "github:justinwoo/easy-dhall-nix";
    easy-dhall-nix.flake = false;
    # easy-dhall-nix.inputs.nixpkgs.follows = "nixpkgs";

    easy-purescript-nix.url = "github:justinwoo/easy-purescript-nix";
    easy-purescript-nix.flake = false;
    # easy-purescript-nix.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, nixpkgs, home-manager, nixos-unstable, easy-purescript-nix
    , easy-dhall-nix, ... }: {
      nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        nixpkgs.overlays = [
          (self: super: {
            inputs = {
              inherit nixpkgs;
              inherit nixos-unstable;
              inherit easy-dhall-nix;
              inherit easy-purescript-nix;
            };
          })
        ];
        modules = [
          home-manager.nixosModules.home-manager
          ./hardware/laptop.nix
          ./configuration.nix
        ];
      };
    };
}