diff --git a/lib/libc_r/sys/Makefile.inc b/lib/libc_r/sys/Makefile.inc
index 16fd33d7650..79d1758aba7 100644
--- a/lib/libc_r/sys/Makefile.inc
+++ b/lib/libc_r/sys/Makefile.inc
@@ -1,5 +1,6 @@
-#	$Id$
+#	$Id: Makefile.inc,v 1.7 1997/05/03 03:57:21 jb Exp $
 
-.PATH:	 ${.CURDIR}/sys
+.PATH:	 ${.CURDIR}/sys ${.CURDIR}/arch/${MACHINE_ARCH}
+
+SRCS+=	__error.c _atomic_lock.S
 
-SRCS+= __error.c
diff --git a/lib/libkse/sys/Makefile.inc b/lib/libkse/sys/Makefile.inc
index 16fd33d7650..79d1758aba7 100644
--- a/lib/libkse/sys/Makefile.inc
+++ b/lib/libkse/sys/Makefile.inc
@@ -1,5 +1,6 @@
-#	$Id$
+#	$Id: Makefile.inc,v 1.7 1997/05/03 03:57:21 jb Exp $
 
-.PATH:	 ${.CURDIR}/sys
+.PATH:	 ${.CURDIR}/sys ${.CURDIR}/arch/${MACHINE_ARCH}
+
+SRCS+=	__error.c _atomic_lock.S
 
-SRCS+= __error.c
diff --git a/lib/libpthread/sys/Makefile.inc b/lib/libpthread/sys/Makefile.inc
index 16fd33d7650..79d1758aba7 100644
--- a/lib/libpthread/sys/Makefile.inc
+++ b/lib/libpthread/sys/Makefile.inc
@@ -1,5 +1,6 @@
-#	$Id$
+#	$Id: Makefile.inc,v 1.7 1997/05/03 03:57:21 jb Exp $
 
-.PATH:	 ${.CURDIR}/sys
+.PATH:	 ${.CURDIR}/sys ${.CURDIR}/arch/${MACHINE_ARCH}
+
+SRCS+=	__error.c _atomic_lock.S
 
-SRCS+= __error.c