Log Message:
Calling time() requires <time.h>. My fault, I think, and/or NetBSD has
or had a namespace pollution issue exposing time.h improperly. Should
fix the MacOS build.

XXX: on MacOS the configure script concludes that stdlib.h, unistd.h,
XXX: and string.h are all missing. I have no idea why this would be
XXX: but someone with access to config.log needs to investigate.