http://bugzilla.xfce.org/show_bug.cgi?id=6785

--- lib/hddtemp.c
+++ lib/hddtemp.c
@@ -102,7 +102,12 @@
     if (!notify_is_initted())
         notify_init(PACKAGE); /* NOTIFY_APPNAME */
 
-    nn = notify_notification_new (summary, body, icon, NULL);
+    nn = notify_notification_new (summary, body, icon
+    #ifdef HAVE_LIBNOTIFY_07
+    );
+    #else
+    , NULL);
+    #endif
     /* FIXME: Use channels or propagate private object or use static global variable */
     //notify_notification_add_action (nn,
                             //"confirmed",
--- lib/sensors-interface.c
+++ lib/sensors-interface.c
@@ -105,7 +105,12 @@
                 if (!notify_is_initted())
                     notify_init(PACKAGE); /* NOTIFY_APPNAME */
 
-                nn = notify_notification_new(summary, body, icon, NULL);
+                nn = notify_notification_new(summary, body, icon
+                #ifdef HAVE_LIBNOTIFY_07
+                );
+                #else
+                , NULL);
+                #endif
                 notify_notification_show(nn, &error);
                 #else
                 DBG("%s\n%s", summary, body);