p4raw-id: //depot/perl@23619
will automagically remove any duplicated directories, while the later
will not.
+Note that if a tainted string is added to C<@INC>, the following
+problem will be reported:
+
+ Insecure dependency in require while running with -T switch
+
=head2 Cleaning Up Your Path
For "Insecure C<$ENV{PATH}>" messages, you need to set C<$ENV{'PATH'}> to