diff --git a/pkgs/desktops/kde-4.2/bindings/builder.sh b/pkgs/desktops/kde-4.2/bindings/builder.sh
new file mode 100644
index 000000000000..73684b4aad89
--- /dev/null
+++ b/pkgs/desktops/kde-4.2/bindings/builder.sh
@@ -0,0 +1,11 @@
+source $stdenv/setup
+
+myPatchPhase()
+{
+    # Fix python site packages directory
+    sed -i -e "s@\${PYTHON_SITE_PACKAGES_DIR}@\${CMAKE_INSTALL_PREFIX}/lib/python2.5@g" \
+           -e "s@\${SIP_DEFAULT_SIP_DIR}@\${CMAKE_INSTALL_PREFIX}/share/sip@g" \
+	   python/pykde4/CMakeLists.txt
+}
+patchPhase=myPatchPhase
+genericBuild
diff --git a/pkgs/desktops/kde-4.2/bindings/default.nix b/pkgs/desktops/kde-4.2/bindings/default.nix
index 339ef48e2edf..05cc1da653d2 100644
--- a/pkgs/desktops/kde-4.2/bindings/default.nix
+++ b/pkgs/desktops/kde-4.2/bindings/default.nix
@@ -7,6 +7,7 @@ stdenv.mkDerivation {
     url = mirror://kde/stable/4.2.0/src/kdebindings-4.2.0.tar.bz2;
     md5 = "6eae8fd968da83fe65e592993e416adc";
   };
+  builder = ./builder.sh;
   CMAKE_PREFIX_PATH=kdepimlibs;
   buildInputs = [ cmake qt4 perl python sip pyqt4
                   kdelibs kdepimlibs automoc4 phonon ];