http://www.perlmonks.org?node_id=268159


in reply to Utility of "use lib qw{ . }" ?

Note that nowhere am I asking perl to use "." in @INC. Yet, perl still sees it.
This is because the default build of perl will include '.' in @INC, although it can configured to leave out '.' and it is also dropped when running in taint mode. See. the @INC section of perlvar for more info.
HTH

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broquaint