Clean install appears successful on a CentOS4.4 Virtuozzo OS template:
(pre-install: cpan force install XSLoader, cpan force install Scalar::Util)
1. ./install.sh -x
2. [script installs RPMs, sets up zimbra home]
3. Once you get to the configuration menu, open another shell and edit ~zimbra/.bashrc, inserting
/usr/bin/perl5: in front of the PERLLIB path list.
4. Press "a" and wait
I would still like to see a better resolution to this, since I am not using the Scalar::Util that Zimbra installs.