compile_et is the error-table compiler used by a handful of things
written at MIT, like Kerberos. In the context of NetBSD, it's
something that tends to make "make build" lose...

if you cd to crypto-us/usr.bin/compile_et, and make and make install
there, then you should be able to successfully make build afterwards.
(Actually, you might need another program from crypto-us/usr.bin
too... make_commands or mkcmds or something.)

-- Dan