$ ./t.perl

Subroutine Net::POP3::starttls redefined at /usr/share/perl5/Net/SSLGlue/POP3.pm line 13.
Subroutine Net::POP3::_STLS redefined at /usr/share/perl5/Net/SSLGlue/POP3.pm line 27.
cannot find and replace IO::Socket::INET superclass at /usr/share/perl5/Net/SSLGlue/POP3.pm line 93.
Compilation failed in require at ./t.perl line 21.
BEGIN failed--compilation aborted at ./t.perl line 21.