In s_bsd.c, comment out all the code in set_sock_opts and
irc/ircd loopback works. All this function does is set
SO_REUSEADDR, possibly SO_USELOOPBACK, and possibly try to change the
RCVBUF/SNDBUF to 8192 bytes.
I hope this information helps those who need a quick workaround
and maybe also leads to a real fix.
Joel Katz
stimpson@igc.net