use lib list;
adds the directories specified in list to @INC.
For each directory $dir in list, lib looks for an architecture-specific subdirectory that has an auto subdirectory under it—that is, it looks for $dir/$archname/auto. If it finds that directory, then $dir/$archname is also added to the front of @INC, preceding $dir.
Normally, you should only add directories to @INC. However, you can also delete directories. The statement:
no lib list
deletes the first instance of each named directory from @INC. To delete all instances of all the specified names from @INC, specify :ALL as the first parameter of list.
As with adding directories, lib checks for a directory called $dir/$archname/auto and deletes the $dir/$archname directory from @INC. You can restore @INC to its original value with:
@INC = @lib::ORIG_INC;
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