I believe it would be useful to have MESSAGEs (or +DISPLAY) to be custom
per operating system. This could be similar to the PLIST's common,
${OPSYS} and .common_end functionality.

This would be useful for several packages to provide a MESSAGE (+DISPLAY)
specific to NetBSD (or different operating systems). For example:
 mail/postfix
 www/navigator (and communicator)
 mail/exim
 mail/imap-uw (or my mail/libc-client)
 textproc/t1lib
 audio/vorbis-tools

It could be more fine-tuned also; for example, don't have it report
messages specific to old NetBSD on new NetBSD systems. (Or maybe, better
yet, just clean up the MESSAGEs that have references to old NetBSD
versions.)

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