i'm not sure why, but without ignoring mtree error (error code 2)

i can't build floppy at all.  hope this is not my pilot error.

distrib/i386/floppies/ramdisk/Makefile

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.18 1999/11/09 00:22:41 he Exp $
+#	$NetBSD: Makefile,v 1.19 1999/12/31 18:34:04 itojun Exp $
 
 TOP=		${.CURDIR}/..
 WARNS=1
@@ -44,7 +44,7 @@ all: ${AUXTARGETS} ${CBIN} ${AUXDEPENDS} ${MTREE} ${LISTS}
 	disklabel -rw ${VND_CDEV} ${DISKTYPE}
 	newfs -B le -m 0 -o space -i 4000 -c 80 ${VND_RDEV} ${DISKTYPE}
 	mount ${VND_DEV} ${MOUNT_POINT}
-	mtree -def ${.CURDIR}/${MTREE} -p ${MOUNT_POINT}/ -u
+	-mtree -def ${.CURDIR}/${MTREE} -p ${MOUNT_POINT}/ -u
 	TOPDIR=${TOP} CURDIR=${.CURDIR} OBJDIR=${.OBJDIR} \
 	    TARGDIR=${MOUNT_POINT} sh ${TOP}/runlist.sh ${.CURDIR}/${LISTS}
 	@echo ""