amavisd will not run

a couple of weeks ago i was able to go through the article 'spam and virus controls with postfix' and have a successful install after some trials and tribulation. looking at the logs i thought that virus control was working but not spamassassin. i posted my logs but i did not get any answers. later i realized that this was because spamassasin was not configured (local.cf). i scrapped my install and configured postfix with anomy, sa and with rbl i am getting good success. but i still wanted to get back my clamav amavisd install so i tried the article again. so i ran cpan modules without spamassain... i am getting an error warning: you do not have permission to install into ///System/Library/Perl/5.8.1/darwin-thread-multi-2level at /System/Library/Perl/5.8.1/ExtUtils/Install.pm line 115 Cannot forceunlink /System/Library/Perl/5.8.1/Net/Cmd.pm: Permission denied at /System/Library/Perl/5.8.1/File/Find.pm line 888 ... NOT OK if anyone can help me here i would greatly appreciate any suggestions. i have been working on this for 3 weeks. tia