/usr/lib/ is in libb-perlreq-perl 0.82-3+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.20/
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/Clobbers.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/Walker.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/ConstOptree.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/PerlReq.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/PerlReq/
/usr/lib/x86_64-linux-gnu/perl5/5.20/PerlReq/Utils.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/B/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/B/ConstOptree/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/B/ConstOptree/ConstOptree.so