diff --git a/pkgs/top-level/default.nix b/pkgs/top-level/default.nix
index bb8f122..38891a4 100644
--- a/pkgs/top-level/default.nix
+++ b/pkgs/top-level/default.nix
@@ -21,7 +21,7 @@
   # `*Platform`s.
   localSystem
 
-, lib
+, lib ? import <auxlib>
 
 , # The system packages will ultimately be run on.
   crossSystem ? localSystem