% perl --version

This is perl 5, version 12, subversion 3 (v5.12.3) built for darwin-thread-multi-2level
(with 2 registered patches, see perl -V for more detail)
[...]

% uname -a
Darwin femto.local 11.0.1 Darwin Kernel Version 11.0.1: Thu Jul 28 02:01:39 PDT 2011; root:xnu-1699.23.4~1/RELEASE_X86_64 x86_64