build failure at disklabel

[bch <brad.harder%gmail.com@localhost>]

cd /usr/src/tools/disklabel/../../sys/ufs &&
/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/bin/nbpax -rw
ffs/ffs_extern.h ffs/fs.h ufs/dinode.h ufs/dir.h ufs/dirhash.h
ufs/extattr.h ufs/inode.h ufs/quota.h ufs/quota1.h ufs/quota2
.h ufs/ufs_bswap.h ufs/ufs_extern.h ufs/ufs_quota.h ufs/ufs_wapbl.h
ufs/ufsmount.h /usr/src/obj/tooldir.NetBSD-7.99.26-amd64/include/nbinclude/ufs
cd /usr/src/obj/tooldir.NetBSD-7.99.26-amd64/include/nbinclude && rm
-f machine &&  /usr/src/obj/tooldir.NetBSD-7.99.26-amd64/bin/x86_64--netbsd-install
-l s -r amd64 machine
#      link  disklabel/disklabel
cc -O -I/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/include
-I/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/include/nbinclude
-I/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/include/compat
-I/usr/src/tools/compat -DHAVE_NBTOOL_CONFIG_H=
1 -D_FILE_OFFSET_BITS=64   -o disklabel main.lo dkcksum.lo interact.lo
printlabel.lo bswap.lo disklabel.lo
-L/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/lib -lnbcompat -lrt -lz
main.lo: In function `find_label':
main.c:(.text+0x1009): undefined reference to `dkcksum_target'
main.c:(.text+0x106e): undefined reference to `targettohlabel'
main.c:(.text+0x10d6): undefined reference to `htotargetlabel'
main.lo: In function `update_label':
main.c:(.text+0x119e): undefined reference to `htotargetlabel'
main.lo: In function `readlabel':
main.c:(.text+0x13ad): undefined reference to `targettohlabel'
main.lo: In function `readlabel_mbr':
main.c:(.text+0x145a): undefined reference to `targettohlabel'
main.lo: In function `main':
main.c:(.text+0x2b5e): undefined reference to `interact'

*** Failed target:  disklabel
*** Failed command: cc -O
-I/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/include
-I/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/include/nbinclude
-I/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/include/compat
-I/usr/src/tools/compat -DH
AVE_NBTOOL_CONFIG_H=1 -D_FILE_OFFSET_BITS=64 -o disklabel main.lo
dkcksum.lo interact.lo printlabel.lo bswap.lo disklabel.lo
-L/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/lib -lnbcompat -lrt -lz
*** Error code 1