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. The checking if
-the specified directories and their architecture-specific
-subdirectories exist is only done once at interpreter startup time and
-not repeated later. So PERL5LIB has no effect for directories that are
-created at runtime.
+locations are automatically included if they exist.
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
-V:path_sep>).
When running taint checks (either because the program was running setuid
-or setgid, or the B<-T> switch was used), neither variable is used.
-The program should instead say:
+or setgid, or the B<-T> or B<-t> switch was specified), neither variable
+is used. The program should instead say:
use lib "/my/directory";