/usr/lib/x86_64-linux-gnu/ is in libgnome2-wnck-perl 0.16-3build2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.22/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Gnome2/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Gnome2/Wnck/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Gnome2/Wnck/Wnck.so
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/ClassGroup.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Selector.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Application.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Install/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Install/Files.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Install/wnck2perl-version.h
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Install/wnck2perl-autogen.h
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Install/wnck2perl.typemap
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Install/wnck2perl.h
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Tasklist.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Window.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/index.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Pager.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Screen.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/main.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck/Workspace.pod
/usr/lib/x86_64-linux-gnu/perl5/5.22/Gnome2/Wnck.pm