p4raw-id: //depot/perl@30648
A list of directories in which to look for Perl library
files before looking in the standard library and the current
directory. Any architecture-specific directories under the specified
-locations are automatically included if they exist.
+locations are automatically included if they exist (this lookup
+being done at interpreter startup time.)
If PERL5LIB is not defined, PERLLIB is used. Directories are separated
(like in PATH) by a colon on unixish platforms and by a semicolon on