http://www.perlmonks.org?node_id=1007547


in reply to Why do multiple requires not work?

You can't use slashes in the name of the required file. You can use either double colons, and no file extension (".pm" is assumed), or you can use a string (a quoted literal or a variable) with a path with slashes and with file extension. So you can do
require "/a/b/script";
if it has no file extension, or
require "/a/b/script.pl";
if it has ".pl" as file extension.