diff -up gnome-session-2.91.91/tools/Makefile.am.libs gnome-session-2.91.91/tools/Makefile.am
--- gnome-session-2.91.91/tools/Makefile.am.libs	2011-03-07 23:08:58.320593583 -0500
+++ gnome-session-2.91.91/tools/Makefile.am	2011-03-07 23:38:02.621786815 -0500
@@ -31,7 +31,8 @@ gnome_session_check_accelerated_helper_C
 
 gnome_session_check_accelerated_helper_LDADD = 		\
 	$(GL_TEST_LIBS)				\
-	$(X_LIBS)
+	$(X_LIBS)				\
+	-lX11
 
 gnome_session_check_accelerated_SOURCES =       \
 	gnome-session-check-accelerated.c
@@ -42,6 +43,7 @@ gnome_session_check_accelerated_CPPFLAGS
 	$(GTK3_CFLAGS)
 
 gnome_session_check_accelerated_LDADD =         \
-	$(GTK3_LIBS)
+	$(GTK3_LIBS)				\
+	-lX11
 
 -include $(top_srcdir)/git.mk