/usr/lib/ is in libqtcore4-perl 4:4.14.1-0ubuntu7.
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/perl5/5.22/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/QtCore4/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/QtCore4/QtCore4.so
/usr/lib/x86_64-linux-gnu/perl5/5.22/QtCore4.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/QtCore4/
/usr/lib/x86_64-linux-gnu/perl5/5.22/QtCore4/slots.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/QtCore4/isa.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/QtCore4/signals.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/QtCore4/classinfo.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/QtCore4/debug.pm