I've also backported some modules (to Perl 5.004 though), and in many cases, it was a simple matter of replacing :

our $foo;

# by

use vars qw($foo);
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There are maybe some quirks, and some early Pelr5 versions do not understand qr(), but in most cases, you should be OK with this substitution.

I recommend taking the included test suite and running it to see which parts of the module broke by backporting.

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web
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