AMaViS - A Mail Virus Scanner

I just updated to the latest version of amavisd-new (2.6.3,1) on FreeBSD.
When I did so, amavisd refused to start, complaining of missing resources
in the spam checking area. I have @bypass_spam_checks_maps = (1); in my
amavisd.conf file and it was working before the update. I added
$extra_code_antispam = 0; before line 13878 of /usr/local/sbin/amavisd to
work around this problem because obviously, this flag is not being set
properly according to the configuration file under the latest version.