If you want to make the constants available in the namespace that uses SPEAK::ITALIAN, you need to export them, just like you did with the sub hello:

@EXPORT = qw(hello HELLO GOODBYE);
[download]

Otherwise, you have to access them fully qualified:

    print SPEAK::ITALIAN::GOODBYE . " in Italiano\n";
[download]

Update: or you could do it the OO way (via inheritance):

package SPEAK::ITALIAN;
use strict;
use warnings;

use constant HELLO   => "Hello";
use constant GOODBYE => "Goodbye";

sub new {
    my $class = shift;
    return bless {}, $class;
}

sub hello {
    print HELLO . " in Italiano\n";
}
1;


# the derived class (SPEAK/ITALIAN/Goodbye.pm)

package SPEAK::ITALIAN::Goodbye;
use strict;
use warnings;

use base "SPEAK::ITALIAN";

sub goodbye {
    my $self = shift;
    print $self->GOODBYE . " in Italiano\n";
}
1;


# your script

#!/usr/bin/perl
use strict;
use warnings;

use SPEAK::ITALIAN::Goodbye;

my $obj = SPEAK::ITALIAN::Goodbye->new();

$obj->hello();
$obj->goodbye();
[download]

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