Building head_at_ 's rescue/rescue

Hi,
	I ran into the following error trying to build rescue/rescue as part of buildworld on 10.2-RELEASE-p7 / i386. Has anyone seen this before?
Thanks,
-NGie

% git log --show-notes --grep svn -n 1
commit 69774947bfffd5e16d26b60a82d880aa659abbf2
Author: imp <imp_at_FreeBSD.org>
Date:   Sat Dec 19 19:20:48 2015 +0000

   Move some MIPS specific flags to be more congruent with other
   architectures.

Notes:
   svn path=/head/; revision=292474

% env NO_CLEAN=1 make buildworld -j2
...
--- rescue ---
cc  -static -o rescue rescue.o cat.lo chflags.lo chio.lo chmod.lo cp.lo date.lo dd.lo df.lo echo.lo ed.lo expr.lo getfacl.lo hostname.lo kenv.lo kill.lo ln.lo ls.lo mkdir.lo mv.lo pkill.lo ps.lo pwd.lo realpath.lo rm.lo rmdir.lo setfacl.lo sh.lo sleep.lo stty.lo sync.lo test.lo badsect.lo camcontrol.lo ccdconfig.lo clri.lo devfs.lo dmesg.lo dump.lo dumpfs.lo dumpon.lo fsck.lo fsck_ffs.lo fsck_msdosfs.lo fsdb.lo fsirand.lo gbde.lo geom.lo ifconfig.lo init.lo kldconfig.lo kldload.lo kldstat.lo kldunload.lo ldconfig.lo md5.lo mdconfig.lo mdmfs.lo mknod.lo mount.lo mount_cd9660.lo mount_msdosfs.lo mount_nfs.lo mount_nullfs.lo mount_udf.lo mount_unionfs.lo newfs.lo newfs_msdos.lo nos-tun.lo ping.lo reboot.lo restore.lo rcorder.lo route.lo routed.lo rtquery.lo rtsol.lo savecore.lo spppcontrol.lo swapon.lo sysctl.lo tunefs.lo umount.lo ping6.lo zfs.lo zpool.lo bsdlabel.lo sconfig.lo fdisk.lo dhclient.lo head.lo mt.lo nc.lo sed.lo tail.lo tee.lo gzip.lo bzip2.lo less.lo xz.lo tar.lo id.lo zdb.lo chroot.lo chown.lo /usr/obj/usr/src/git/rescue/rescue/../librescue/exec.o /usr/obj/usr/src/git/rescue/rescue/../librescue/getusershell.o /usr/obj/usr/src/git/rescue/rescue/../librescue/login_class.o /usr/obj/usr/src/git/rescue/rescue/../librescue/popen.o /usr/obj/usr/src/git/rescue/rescue/../librescue/rcmdsh.o /usr/obj/usr/src/git/rescue/rescue/../librescue/sysctl.o /usr/obj/usr/src/git/rescue/rescue/../librescue/system.o -lcrypt -ledit -ljail -lkvm -lelf -ll -ltermcapw -lutil -lxo -l80211 -lalias -lcam -lncursesw -ldevstat -lipsec -llzma -lavl -lzpool -lzfs_core -lzfs -lnvpair -lpthread -luutil -lumem -lgeom -lbsdxml -lkiconv -lmt -lsbuf -lufs -lz -lbz2 -larchive -lcrypto -lmd -lm
nc.lo: In function `_$$hide$$ nc.lo main':
(.text+0x750): warning: warning: mktemp() possibly used unsafely; consider using mkstemp()
--- all_subdir_sbin ---
--- ea.o ---
cc  -O2 -pipe -O2 -pipe -I/usr/src/git/sbin/fsck_ffs -I/usr/src/git/sbin/fsck_ffs/../mount   -g -MD -MP -MF.depend.ea.o -MTea.o -std=gnu99 -fstack-protector-strong -Wsystem-headers -Werror -Wall -Wno-format-y2k -Wno-uninitialized -Wno-pointer-sign -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable -Wno-tautological-compare -Wno-unused-value -Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion -Wno-unused-local-typedef -Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter -Qunused-arguments -c /usr/src/git/sbin/fsck_ffs/ea.c -o ea.o
--- fsutil.o ---
cc  -O2 -pipe -O2 -pipe -I/usr/src/git/sbin/fsck_ffs -I/usr/src/git/sbin/fsck_ffs/../mount   -g -MD -MP -MF.depend.fsutil.o -MTfsutil.o -std=gnu99 -fstack-protector-strong -Wsystem-headers -Werror -Wall -Wno-format-y2k -Wno-uninitialized -Wno-pointer-sign -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable -Wno-tautological-compare -Wno-unused-value -Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion -Wno-unused-local-typedef -Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter -Qunused-arguments -c /usr/src/git/sbin/fsck_ffs/fsutil.c -o fsutil.o
--- all_subdir_rescue ---
/usr/obj/usr/src/git/tmp/usr/lib/libkvm.a(kvm.o): In function `_kvm_open':
/usr/src/git/lib/libkvm/kvm.c:444: undefined reference to `__start_set_kvm_arch'
/usr/src/git/lib/libkvm/kvm.c:444: undefined reference to `__stop_set_kvm_arch'
/usr/src/git/lib/libkvm/kvm.c:444: undefined reference to `__stop_set_kvm_arch'
cc: error: linker command failed with exit code 1 (use -v to see invocation)
*** [rescue] Error code 1

bmake[5]: stopped in /usr/obj/usr/src/git/rescue/rescue
1 error

bmake[5]: stopped in /usr/obj/usr/src/git/rescue/rescue
*** [rescue] Error code 2

bmake[4]: stopped in /usr/src/git/rescue/rescue
1 error

bmake[4]: stopped in /usr/src/git/rescue/rescue
*** [all] Error code 2

bmake[3]: stopped in /usr/src/git/rescue
1 error

bmake[3]: stopped in /usr/src/git/rescue
*** [all_subdir_rescue] Error code 2

…

$ cc --version
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
Target: i386-unknown-freebsd10.2
Thread model: posix
$ strings /usr/obj/usr/src/git/tmp/usr/lib/libkvm.a | egrep -n '__(stop|start)_set_kvm_arch'
97:__start_set_kvm_arch
98:__stop_set_kvm_arch
140:__start_set_kvm_arch
141:__stop_set_kvm_arch
182:__start_set_kvm_arch
183:__stop_set_kvm_arch
233:__start_set_kvm_arch
234:__stop_set_kvm_arch
296:__start_set_kvm_arch
297:__stop_set_kvm_arch
395:__start_set_kvm_arch
396:__stop_set_kvm_arch
472:__start_set_kvm_arch
473:__stop_set_kvm_arch
526:__start_set_kvm_arch
527:__stop_set_kvm_arch
589:__start_set_kvm_arch
590:__stop_set_kvm_arch
651:__start_set_kvm_arch
652:__stop_set_kvm_arch
711:__start_set_kvm_arch
712:__stop_set_kvm_arch
3510:__start_set_kvm_arch
3585:__stop_set_kvm_arch
3970:__start_set_kvm_arch
3971:__stop_set_kvm_arch
$