amavisd startup error

I've been going through the "Spam and Virus Controls with Postfix" article. When I get to the step when I am supposed to start amavisd debug, I get the following error message: Can't locate BerkeleyDB.pm in @INC (@INC contains: /System/Library/Perl//darwin-2level /System/Library/Perl/ /Library/Perl//darwin-2level /Library/Perl/ /Library/Perl/ /Network/Library/Perl//darwin-2level /Network/Library/Perl/ /Network/Library/Perl/) at /usr/bin/amavisd line 5025. BEGIN failed--compilation aborted at /usr/bin/amavisd line 5025. BerkeleyDB.pm is in my CPAN directory and even when I moved it to /Library/Perl it did not work (not sure if I was supposed to even do that) Please help.