I re-updated a couple of times, and even nuked these directories and
tried again.

I've rebuilt make, installed new share/mk files, and so on.

cleandir ===> grep
rm -f grep.o dfa.o kwset.o obstack.o savedir.o getopt.o getopt1.o search.o
stpcpy.o regex.o grepmat.o  grep.ln dfa.ln kwset.ln obstack.ln savedir.ln
getopt.ln getopt1.ln search.ln stpcpy.ln regex.ln grepmat.ln
rm -f grep.1 grep.info grep.cat1
rm -f a.out [Ee]rrs mklog core *.core grep
rm: grep: is a directory
*** Error code 1

Stop.
make: stopped in /usr/src/gnu/usr.bin/grep
*** Error code 1