diff -up workrave-1.8.5/frontend/gtkmm/src/GnomeAppletWindow.hh.sigc workrave-1.8.5/frontend/gtkmm/src/GnomeAppletWindow.hh
--- workrave-1.8.5/frontend/gtkmm/src/GnomeAppletWindow.hh.sigc	2008-04-04 11:28:52.000000000 +0200
+++ workrave-1.8.5/frontend/gtkmm/src/GnomeAppletWindow.hh	2008-04-04 11:29:02.000000000 +0200
@@ -25,7 +25,7 @@
 #include "AppletWindow.hh"
 
 #ifdef HAVE_GTKMM24
-#include <sigc++/compatibility.h>
+#include <sigc++/object.h>
 #endif
 
 #include <gnome.h>