$ PERL5LIB=/foo/bar perl -MNot::Exist -e1
Can't locate Not/Exist.pm in @INC (@INC contains: /foo/bar /etc/perl /usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14 /usr/local/lib/site_perl .).
BEGIN failed--compilation aborted.