I've tested 1.13.4rc1 on NetBSD-7.99.33 and it built fine, thank you.

There are a couple of patches in pkgsrc by joerg that, it seems, have
not been sent upstream. They remove the inclusion of getopt.h. At
least on NetBSD, the getopt(3) man page mentions that getopt is in
unistd.h.

Cheers,
 Thomas