http://www.perlmonks.org?node_id=1165157


in reply to The "right" way to make your script run with old versions of perl

Have a look at if if you don't want to 
eval "use $module";

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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In Section Seekers of Perl Wisdom