/usr/lib/x86_64-linux-gnu/ is in libfile-fcntllock-perl 0.22-1+b1.
This file is owned by root:root, with mode 0o755.
..
/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/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/File/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/File/FcntlLock/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/File/FcntlLock/FcntlLock.so
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock.pod
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock/
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock/Pure.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock/Core.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock/Pure.pod
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock/Errors.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock/Inline.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock/XS.pod
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock/XS.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/File/FcntlLock/Inline.pod