There is a saying:

"Only Perl can parse Perl."

I assume by pp you mean some kind of Perl Packager as opposed to the Perl byte code. Some things that could introducing dependancies:

IO::Socket::INET->new returns a reference to a IO::Socket object. You should use defined() to check the return value or, better yet, enclose it in an eval.

The use of a symbolic Filehandle involves a lot of perl magic which may not be portable.

You should check if the socket is connecting.

($host eq $fh->connected()) or die "Can't connect to $host\n";
[download]

Explicitly turn autoflush on.

$fh->autoflush(1);
[download]

Good Luck

---