-DEXTENDED_NUMERICS This option configures the server to send
extended numerics as well as parse them. This option should only
be used on networks that run ircu2.10.07 and above only.
--DFERGUSON_FLUSHER This causes your server to attempt to flush
-it's internal buffers before dropping clients during a netbreak.
-This option *may* panic your server - especially if your running
-on a unconfigured FreeBSD box. If you can define this we recommend
-you do - but beware of spontanious reboots on netbreak.
-DWALLOPS_OPER_ONLY Setting this option removes the ability for
clients that are not opered to see wallops messages.
-DNOOPER Disallow the /oper command.