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
./Configure -des -Dprefix=/home/cavac/bin/CavacPerl-5.40.0
make
make test
make install

##</code><code>##

#!/usr/bin/env perl

use v5.40;
use strict; # <-- technically not required, but makes it clear to the reader we are using strict
use warnings; # <-- technically not required (i think), but makes it clear to the reader we are using warnings

# <- no *EXPERIMENTAL* stuff here

for(my $i = 0; $i < 10; $i++) {
    # Note to reader: Yes, could have used a trinary here, but those are hard to read
    # and therefore forbidden in my codebase
    print "$i is ";
    if(!iseven($i)) {
        print "NOT ";
    }
    print "even\n";
}

sub iseven($val) {
   if($val % 2 == 0) {
       return true; # !!!!! A NATIVE BOOLEAN!!!!
   }
   return false; # The *other*, more pessimistic, native boolean ;-)
}