However, any XSUB-based (.xs) modules require recompilation and reinstallation.

When you use Solaris 10, you must execute the following command as root to get ANYTHING from CPAN to build:

perl -MCPAN -e 'force install("Scalar::Util")'

Otherwise there is no .XS support, and you are so screwed.

How to use perl on Solaris 10 : docs.sun.com: System Administration Guide: Network Services