/usr/lib/ is in libqtcore4-perl 4.8.4-1.2.
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/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/QtCore4/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/QtCore4/QtCore4.so
/usr/lib/x86_64-linux-gnu/perl5/5.20/QtCore4/
/usr/lib/x86_64-linux-gnu/perl5/5.20/QtCore4/debug.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/QtCore4/slots.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/QtCore4/signals.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/QtCore4/isa.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/QtCore4/classinfo.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/QtCore4.pm