use lib 'S:\incubator\ex\Hello.pm';
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Add the directory in which modules reside, rather than the full path to the module. Also you still need to use it:

use strict;
use warnings;

use lib '/home/marto/temp';
use Hello;

my $obj = Hello->new( sample_data => 'hello world',
                      more_data   => 'blah blah blah' );
$obj->sample_method();
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Also: lib.