{
  description = "a collection of personal nix configurations";

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

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

  outputs = inputs @ { self, nixpkgs, ... }:
    let
      inherit (lib.my) mapModules mapModulesRec mapHosts;
      system = "aarch64-linux";

      mkPkgs = pkgs: extraOverlays: 
        import pkgs {
          inherit system;
          config.allowUnfree = true;
          config.allowAliases = false;
          overlays = extraOverlays ++ (lib.attrValues self.overlays);
        };
      pkgs = mkPkgs nixpkgs [ self.overlays.default ];

      lib = nixpkgs.lib.extend (final: prev: {
        my = import ./lib {
          inherit pkgs inputs;
          lib = final;
        };
      });
    in {
      lib = lib.my;
    
      overlays = 
        (mapModules ./overlays import)
        // {
          default = final: prev: {
            my = self.packages.${system};
          };
        };
      
      packages."${system}" = mapModules ./packages (p: pkgs.callPackage p {});
      
      nixosModules = mapModulesRec ./modules import;
      
      nixosConfigurations = mapHosts ./hosts {};
    };
}