The ebuild for bnc moves the password util from 'mkpasswd' to 'bncmkpasswd' but forgets to edit the setup script bncsetup. The script should change all ./mkpasswd to '/usr/bin/bncmkpasswd' in the bncsetup script.
net-irc/bnc-2.9.3-r1 with a fix in CVS. Thanks!