What operating systems need security/openssh/MESSAGE.urandom?

That MESSAGE is probably only for NetBSD. Maybe MESSAGE.NetBSD should be
used, but then maybe that is not true for old NetBSD kernels?

Maybe something like:

.if exists(/dev/urandom)
.  if ${OPSYS} == "NetBSD"
MESSAGE_SRC+=           ${.CURDIR}/MESSAGE.urandom
.  endif
.else
CONFIGURE_ARGS+=        --without-random
CONFS+=                 ssh_prng_cmds
PLIST_SRC+=             ${.CURDIR}/PLIST.prng
.endif

The +DISPLAY would be confusing to Linux and maybe other users.

   Jeremy C. Reed
   http://www.reedmedia.net/