Sun OS 5.9 ( if i remember the versioning numbers correctly ), I think the Unix SA's here refer to it as Solaris 9. It is running on Fujitsu box. Looks like your successful install was done on Perl 5.8.0 while I was trying to install into 5.8.8. Did you have the version module installed too?

edit: fixed os version number.
edit: added module tags due to jdporter's suggestion