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$ perlbrew install --as perl-5.16.0t -Dusethreads perl-5.16.0

$ perlbrew list
* perl-5.16.0       #this perl was already installed
...
$perlbrew list
  perl-5.16.0
* perl-5.16.0t

use strict; 
use warnings; 
...
count: 10
Joe

$ perlbrew switch perl-5.16.0t

   
Generic command options:

        -q --quiet     Be quiet on informative output message.
        -v --verbose   Tell me more about it.