diff -up notification-daemon-0.4.1/configure.ac.libs notification-daemon-0.4.1/configure.ac
--- notification-daemon-0.4.1/configure.ac.libs	2010-02-13 23:44:50.372114290 -0500
+++ notification-daemon-0.4.1/configure.ac	2010-02-13 23:46:23.594114004 -0500
@@ -83,6 +83,7 @@ pkg_modules="
 	dbus-glib-1 >= $REQ_DBUS_VERSION, \
 	gconf-2.0, \
 	libwnck-1.0 \
+        x11 \
 "
 PKG_CHECK_MODULES(NOTIFICATION_DAEMON, $pkg_modules)
 AC_SUBST(NOTIFICATION_DAEMON_CFLAGS)