{ 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);
}