diff --git a/lib/libxpg4/fakelib.c b/lib/libxpg4/fakelib.c
index efec8b9cf06f..add637aa6a09 100644
--- a/lib/libxpg4/fakelib.c
+++ b/lib/libxpg4/fakelib.c
@@ -1,2 +1,8 @@
 /* $FreeBSD$ */
+
+/* libxpg4 is obsolete in FreeBSD 6 -- library has been merged into libc. */
+#define	OBSOLETE_IN_6
+
+#include <sys/param.h>
+
 static int ___fake_library___;