diff --git a/pkgs/data/misc/shared-desktop-ontologies/default.nix b/pkgs/data/misc/shared-desktop-ontologies/default.nix
index c302e3504da..b4713794a03 100644
--- a/pkgs/data/misc/shared-desktop-ontologies/default.nix
+++ b/pkgs/data/misc/shared-desktop-ontologies/default.nix
@@ -1,15 +1,10 @@
-{stdenv, fetchurl, cmake, v ? "0.2"}:
+{stdenv, fetchurl, cmake}:
 
 stdenv.mkDerivation rec {
-  name = "shared-desktop-ontologies-${v}";
+  name = "shared-desktop-ontologies-0.5";
   src = fetchurl {
     url = "mirror://sf/oscaf/${name}.tar.bz2";
-    sha256 =
-      if v == "0.2" then
-        "1w9gfprrp518hb7nm5wspxjd7xx0h08bph6asrx5vrx7j7fzg4m7"
-      else if v == "0.5" then
-        "1a1gs2b314133rg7vzwvnqbxchf7xgs0jpkydid5l2wz98m7j17r"
-      else throw "Unknown version";
+    sha256 = "1a1gs2b314133rg7vzwvnqbxchf7xgs0jpkydid5l2wz98m7j17r";
   };
   buildInputs = [ cmake ];
   meta = with stdenv.lib; {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6d1b130e0ba..64eb6a11562 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3703,7 +3703,7 @@ let
     mysqlSupport = true;
   };
 
-  qt4 = qt46;
+  qt4 = pkgs.kde4.qt4;
 
   qt45 = callPackage ../development/libraries/qt-4.x/4.5 {
     inherit (gnome) glib;
@@ -6697,21 +6697,16 @@ let
 
   kde4 = kde44;
 
-  kde44 = makeOverridable (import ../desktops/kde-4.4) (pkgs // {
-    qt4 = pkgs.qt46;
-    stdenv = pkgs.stdenv2;
-  });
+  kde44 = makeOverridable (import ../desktops/kde-4.4) (
+    applyGlobalOverrides (p: { kde4 = p.kde44; qt4 = p.qt46; }) //
+    { stdenv = pkgs.stdenv2; });
 
   kde45 = callPackage ../desktops/kde-4.5 {
-    callPackage = newScope ({
-      qjson  = pkgs.qjson.override { inherit (pkgs.kde45) qt4; };
-      pyqt4 = pkgs.pyqt4.override { inherit (pkgs.kde45) qt4; };
-      libdbusmenu_qt = pkgs.libdbusmenu_qt.override { inherit (pkgs.kde45) qt4; };
-      libktorrent = pkgs.libktorrent.override {
-        inherit (pkgs.kde45) qt4 kdelibs;
-      };
-      shared_desktop_ontologies = pkgs.shared_desktop_ontologies.override { v = "0.5"; };
-    } // pkgs.kde45);
+    callPackage =
+      let
+        pkgs_for_45 = (applyGlobalOverrides (p: { kde4 = p.kde45; }));
+      in
+        pkgs_for_45.newScope pkgs_for_45.kde45;
     stdenv = pkgs.stdenv2;
   };