title: How can I ensure a Perl script works with an older version?
body: <p>Similar but different to <a href="https://stackoverflow.com/questions/1377469/how-can-i-check-that-a-perl-version-is-not-greater-than-some-value">this</a>.</p>
  
  <p>I am writing a perl script, foo.pl.  I use Perl 5.10 on my machine to run foo.pl.  I have to also make sure that foo.pl can be run by Perl 5.8.8.  Is there a way to do so without just installing v5.8.8?</p>