diff --git a/openembedded/conf/distro/poky-additions.inc b/openembedded/conf/distro/poky-additions.inc
index b882342f98..278c07abbe 100644
--- a/openembedded/conf/distro/poky-additions.inc
+++ b/openembedded/conf/distro/poky-additions.inc
@@ -9,17 +9,18 @@ DISTRO_TYPE = "debug"
 
 PREFERRED_PROVIDER_gconf=gconf-dbus
 
-PREFERRED_VERSION_libmatchbox ?= "1.7"
-PREFERRED_VERSION_matchbox ?= "0.9.1"
-PREFERRED_VERSION_matchbox-common ?= "0.9.1"
-PREFERRED_VERSION_matchbox-desktop ?= "0.9.1"
-PREFERRED_VERSION_matchbox-wm ?= "svn"
-PREFERRED_VERSION_matchbox-panel ?= "0.9.2"
-PREFERRED_VERSION_matchbox-applet-inputmanager ?= "0.6"
+PREFERRED_VERSION_libmatchbox = "1.7"
+PREFERRED_VERSION_matchbox = "0.9.1"
+PREFERRED_VERSION_matchbox-common = "0.9.1"
+PREFERRED_VERSION_matchbox-desktop = "0.9.1"
+PREFERRED_VERSION_matchbox-wm = "svn"
+PREFERRED_VERSION_matchbox-panel = "0.9.2"
+PREFERRED_VERSION_matchbox-applet-inputmanager = "0.6"
 
-PREFERRED_VERSION_atk ?= "1.10.0"
-PREFERRED_VERSION_cairo ?= "1.0.0"
-PREFERRED_VERSION_glib-2.0 ?= "2.8.1"
-PREFERRED_VERSION_gtk+ ?= "2.8.3"
-PREFERRED_VERSION_pango ?= "1.10.0"
+PREFERRED_VERSION_atk = "1.10.0"
+PREFERRED_VERSION_cairo = "1.0.0"
+PREFERRED_VERSION_glib-2.0 = "2.8.1"
+PREFERRED_VERSION_gtk+ = "2.8.3"
+PREFERRED_VERSION_pango = "1.10.0"
 
+PREFERRED_VERSION_dbus = "0.36"