Description of problem:
After updating CentOS 5.5 to latest version perl-Archive-Tar-1.39.1-1.el5_5.1.noarch.rpm 
sa-update (spamassassin version 3.2.5) is quiting with this error:
Argument "1.39_01" isn't numeric in subroutine entry at /usr/bin/sa-update line 81.


Version-Release number of selected component (if applicable):
perl-Archive-Tar-1.39.1-1.el5_5.1.noarch.rpm


How reproducible:
update to perl-Archive-Tar-1.39.1-1.el5_5.1.noarch.rpm and run sa-update


Additional info:
Changin $VERSION vlauer in in /usr/lib/perl5/vendor_perl/5.8.8/Archive/Tar.pm

from
$VERSION = "1.39_01";

to
$VERSION = "1.3901";

"fixed" this. 
sa-update complains about any non-numeric character after the first "." in $VERSION