{ lib }:
rec {
  toPackages = pkgNames: pkgs: map (pn: lib.getAttr pn pkgs) pkgNames;
  toBuildInputs = pkgArches: archPkgs: lib.concatLists (map archPkgs pkgArches);
  mkBuildInputs = pkgArches: pkgNames: toBuildInputs pkgArches (toPackages pkgNames);
}
