diff --git a/lib/compat/Makefile b/lib/compat/Makefile
index 4de61092e2a5..2a5908ac592b 100644
--- a/lib/compat/Makefile
+++ b/lib/compat/Makefile
@@ -1,4 +1,4 @@
-# $Id$
+# $Id: Makefile,v 1.3 1997/02/22 14:57:32 peter Exp $
 
 SUBDIR=
 
@@ -12,5 +12,8 @@ SUBDIR+=	compat20
 .if defined(COMPAT21) || defined(RELEASEDIR)
 SUBDIR+=	compat21
 .endif
+.if defined(COMPAT3X) || defined(RELEASEDIR)
+SUBDIR+=	compat3x
+.endif
 
 .include <bsd.subdir.mk>