#!/usr/bin/perl
use strict;
use warnings;
use Perl::MinimumVersion::Fast;

# Perl::MinimumVersion::Fast - another module which does the same thing.
# It's a lot faster, but only supports Perl 5.8.1+.
my $filename = 'test.pl';
my $p = Perl::MinimumVersion::Fast->new($filename);
print "Minimum: " . $p->minimum_version, "\n";

__END__

$ perl version.pl
Minimum: 5.006