in reply to Re^4: Know a perl's -I flag from perl?
in thread Read a perl's -I flag from perl?

...

So before your script diddles @INC, preserve it? 

use constant FINC => [ @INC ];
use lib ...;

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And if you're worried about that, then worry about PERLLIB/PERL5LIB/PERL5OPTS...

In Section Seekers of Perl Wisdom