Get out of the habit of evaluating your code in the manner shown.

If you must, write a script that does what you want and run it against different Perl versions. I prefer to use Test::More and run that periodically to catch errors that will appear over time as dependencies change. I hear h2xs is deprecated but I will use it for instructional purposes here:

cd /tmp
h2xs -AXn junk
cd ./junk
cd t
cat junk.t
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Above produces boilerplate test code you can produce literally in seconds.

use strict;
use warnings;
use Test::More tests => 2;
BEGIN {
     use_ok('DMCombo2');};  
...
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Change things for your environment. Six months down the road you will be thanking yourself for investing the time to learn this stuff.