compile:
./configure --with-irssi=~/src/irssi-0.8.15 make
install globally:
make install
install in home directory:
make user_install
load in irssi:
/LOAD icb /SERVER -icbnet icb default.icb.net
to make autoconnecting etc. work you'll need to edit config file and add to chatnets section:
icbnet = { type = "ICB"; };
then run once:
/SERVER ADD -auto -icbnet icbnet default.icb.net 7326
plus put into your ~/.irssi/startup:
load icb