ip acct and devel. kernel

[Max <davros@cyclone.Stanford.EDU>]

Is there something special I need to do to be able to use IP
accounting with the development kernel (2.1.121)?  /proc/net/ip_acct
doesn't exist and programs such as ipacset and ipfwadm complain about
it.  What's going on?  Do I need to enable IP firewalling in the
kernel?  If so, that option is greyed out and I have no idea how to
ungrey it so that I can enable it.

Thanks for any help,
    Max