$ perl -Mwarnings -Mstrict -E 'say "@INC"'
/some/path /other/path ...

$ perl -Mwarnings -Mstrict -E 'use lib; say "@INC"'
/some/path /other/path ...

$ perl -Mwarnings -Mstrict -E 'use lib my $x = "fred"; say "@INC"'
fred /some/path /other/path ...