Versions of perl being those released on CPAN, aka official perl releases.
update:
Also, core modules are generally located in perl -V:installarchlib -V:installprivlib,
although this is not guaranteed to remain true
(like if you upgrade a certain module, it may move to perl -V:sitelib).
MJDsays "you can't just make shit up and expect the computer to know what you mean, retardo!"