{
  description = "PVV-DNS";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";

    # Broken, wait for https://github.com/nix-community/dns.nix/pull/52
    #dns.url = "github:nix-community/dns.nix";
    dns.url = "github:felixalbrigtsen/dns.nix";
    dns.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs =
    { self, nixpkgs, dns, ... }@inputs:
    let
      inherit (nixpkgs) lib;
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "aarch64-darwin"
      ];
      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system nixpkgs.legacyPackages.${system});
    in
    {
      packages = forAllSystems (system: pkgs: rec {
        zoneFiles = pkgs.callPackage ./zoneConfig.nix {
          inherit dns;
        };

        nsdConfig = pkgs.callPackage ./nsd.conf.nix { };

        default = pkgs.runCommand "pvv-dns" { } ''
          mkdir -p $out/zones
          mkdir -p $out/etc/nsd

          cp -r ${zoneFiles}/* $out/zones/
          cp -r ${nsdConfig} $out/etc/nsd/nsd.conf
        '';
      });

      checks = forAllSystems (system: _: rec {
        zoneFiles = self.packages.${system}.zoneFiles.overrideAttrs { doCheck = true; };
        nsdConfig = self.packages.${system}.nsdConfig.overrideAttrs { doCheck = true; };
      });
    };
}