amavisd-new errors after portupgrade

[albi]

here's the error with the upgraded amavisd-new :

/usr/local/etc/rc.d/amavisd.sh restart
Stopping amavisd.
Waiting for PIDS: 976.
Starting amavisd.
ERROR: MISSING REQUIRED BASIC MODULES:
  Carp::Heavy
BEGIN failed--compilation aborted at /usr/local/sbin/amavisd line 124.

after using Google for a while i couldn't find which port "Carp::Heavy"
comes from (or should come from)

copying back the previous /usr/local/sbin/amavisd over the new one,
makes it work OK

any ideas how to resolve this (that is, make the newer amavisd-new work)

tia!