/usr/lib/x86_64-linux-gnu/perl5/ is in libgtk2-notify-perl 0.05-4build2.
This file is owned by root:root, with mode 0o755.
..
/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/Gtk2/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Gtk2/Notify/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Gtk2/Notify/Notify.so
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Notify.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Notify/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Notify/index.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Notify/Install/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Notify/Install/notify-autogen.h
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Notify/Install/notify.typemap
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Notify/Install/Files.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gtk2/Notify.pod