replace-dependency: don't break nixpkgs for people living in the ston…

…e age
NixOS · Jan 12, 2013 · 5626c5c · 5626c5c
1 parent 1f07564
commit 5626c5c
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
@@ -344,9 +344,9 @@ let
     inherit stdenv;
   };
 
-  "replace-dependency" = import ../build-support/replace-dependency.nix {
+  "replace-dependency" = if builtins ? langVersion then import ../build-support/replace-dependency.nix {
     inherit runCommand nix lib;
-  };
+  } else args: throw "You must be using at least nix-1.2 to use replace-dependency";
 
   nukeReferences = callPackage ../build-support/nuke-references/default.nix { };