$perl sockettest.pl 
Socket defines neither package nor VERSION--version check failed at /usr/local/ActivePerl-5.10/lib/IO/Socket.pm line 12.
BEGIN failed--compilation aborted at /usr/local/ActivePerl-5.10/lib/IO/Socket.pm line 12.
Compilation failed in require at sockettest.pl line 25.
BEGIN failed--compilation aborted at sockettest.pl line 25.

##</code><code>##

$perl
use IO::Socket;