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wget https://www.cpan.org/src/5.0/perl-5.40.0.tar.gz
tar -xzf perl-5.40.0.tar.gz
cd perl-5.40.0
...
make
make test
make install

#!/usr/bin/env perl

use v5.40;
...
   }
   return false; # The *other*, more pessimistic, native boolean ;-)
}