$ grep VERSION /usr/opt/perl5/lib/5.8.2/aix-thread-multi/MIME/Base64.pm
use vars qw(@ISA @EXPORT $VERSION $OLD_CODE);
$VERSION = '2.21';
eval { bootstrap MIME::Base64 $VERSION; };

$ strings /usr/opt/perl5/lib/5.8.2/aix-thread-multi/auto/MIME/Base64/Base64.so | grep ^[0-9]
2.21
2.21