# Module1.pm
# ==========

package Module1;
our $VERSION = '2.0';
1;

##</code><code>##

# Module2.pm
# ==========

package Module2;
use Exporter ();
our $VERSION = '2.0';
our @ISA = 'Exporter';
1;

##</code><code>##

# script.pl
# =========

BEGIN { print("Loading Module1...\n"); }
use Module1 '3.0';
BEGIN { print("Loaded.\n"); }

BEGIN { print("Loading Module2...\n"); }
use Module2 '3.0';
BEGIN { print("Loaded.\n"); }

##</code><code>##

output
======

Loading Module1...
Loaded.
Loading Module2...
Module2 3.0 required--this is only version 2.0 (Module2.pm) at script.pl line 6
BEGIN failed--compilation aborted at script.pl line 6.

##</code><code>##

package Module2;
use Exporter ();
our $VERSION = '2.0';
*import = \&Exporter::import;
1;

##</code><code>##

package Module2;
use Exporter ();
our $VERSION = '2.0';
*import          = \&Exporter::import;
*require_version = \&Exporter::require_version;
1;