dash: fix compilation on darwin

it has been broken since: https://github.com/NixOS/nixpkgs/commit/adbace3c212a64cfa151590f907965aa3eaabf8b

pkgs/shells/dash/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl }:
+{ autoreconfHook, lib, stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
   name = "dash-0.5.11.1";
@@ -10,6 +10,10 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = [ "format" ];
 
+  # Temporary fix until a proper one is accepted upstream
+  patches = lib.lists.optional stdenv.isDarwin ./0001-fix-dirent64-et-al-on-darwin.patch;
+  nativeBuildInputs = lib.lists.optional stdenv.isDarwin autoreconfHook;
+
   meta = with stdenv.lib; {
     homepage = "http://gondor.apana.org.au/~herbert/dash/";
     description = "A POSIX-compliant implementation of /bin/sh that aims to be as small as possible";