I'm trying to build an Installation Kernel (mac68k) on sources brought up to
-current this past weekend.  Does anyone recognize what's happening here and
what to do to fix it?

cc -static -o ramdiskbin ramdiskbin.o cat.cro chmod.cro chown.cro chroot.cro cp.cro dd.cro df.cro disklabel.cro ed.cro fsck.cro fsck_ffs.cro ftp.cro gzip.cro ifconfig.cro init.cro less.cro ln.cro ls.cro mkdir.cro mknod.cro mount.cro mount_cd9660.cro mount_ffs.cro mount_msdos.cro mount_nfs.cro mount_kernfs.cro mt.cro mv.cro newfs.cro ping.cro pwd.cro reboot.cro restore.cro rm.cro route.cro sed.cro sh.cro shutdown.cro slattach.cro stty.cro swapctl.cro sync.cro test.cro tip.cro umount.cro sysinst.cro pax.cro tset.cro -L/usr/lib  -ledit -lutil -lcurses -ltermcap -lrmt -lcrypt -ll -lm
gzip.cro: Undefined symbol `_bzDecompressInit' referenced from text segment
gzip.cro: Undefined symbol `_bzDecompress' referenced from text segment
gzip.cro: Undefined symbol `_bzDecompressEnd' referenced from text segment
sysinst.cro: Undefined symbol `_refresh' referenced from text segment
collect2: ld returned 1 exit status
*** Error code 1

Stop.
*** Error code 1

Stop.
*** Error code 1

Stop.