diff --git a/pkgs/desktops/kde-4.2/sdk/default.nix b/pkgs/desktops/kde-4.2/sdk/default.nix
index 4083f28c0b6..353e5ccfe72 100644
--- a/pkgs/desktops/kde-4.2/sdk/default.nix
+++ b/pkgs/desktops/kde-4.2/sdk/default.nix
@@ -8,6 +8,8 @@ stdenv.mkDerivation {
     sha1 = "dca74527bcf6e5925ec58a74196e683cc68a259a";
   };
   CMAKE_PREFIX_PATH=kdepimlibs;
+  builder=./builder.sh;
+  inherit aprutil;
   buildInputs = [ cmake qt4 perl libxml2 libxslt boost subversion apr aprutil
                   kdelibs kdepimlibs automoc4 phonon strigi ];
 }