$ perl -e " require >= 5.8.0; "
Null filename used at -e line 1.

$ perl -e " require ; "
Null filename used at -e line 1.

$ perl -e " require 5.8.0; "

$ perl -e " require 5.18.0; "
Perl v5.18.0 required--this is only v5.14.1, stopped at -e line 1.