/usr/lib/x86_64-linux-gnu/perl5/ is in libb-hooks-op-check-perl 0.19-2+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/5.20/
/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/Hooks/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/B/Hooks/OP/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/B/Hooks/OP/Check/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/B/Hooks/OP/Check/Check.so
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/Hooks/
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/Hooks/OP/
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/Hooks/OP/Check.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/Hooks/OP/Check/
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/Hooks/OP/Check/Install/
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/Hooks/OP/Check/Install/hook_op_check.h
/usr/lib/x86_64-linux-gnu/perl5/5.20/B/Hooks/OP/Check/Install/Files.pm