or download this
Karls-Mac-mini:~ karl$ perlbrew install --as perl-5.30.3-threads -Duse
+threads perl-5.30.3
Installing /Users/karl/perl5/perlbrew/build/perl-5.30.3/perl-5.30.3 in
+to ~/perl5/perlbrew/perls/perl-5.30.3-threads
...
perlbrew --notest install perl-5.30.3
perlbrew --force install perl-5.30.3