/usr/ is in libvirt-dev 1.2.2-0ubuntu13.
This file is owned by root:root, with mode 0o755.
..
/usr/share/libvirt/api/
/usr/lib/
/usr/lib/pkgconfig/
/usr/lib/pkgconfig/libvirt.pc
/usr/share/
/usr/share/libvirt/
/usr/share/libvirt/api/libvirt-lxc-api.xml
/usr/share/libvirt/api/libvirt-api.xml
/usr/share/libvirt/api/libvirt-qemu-api.xml
/usr/share/doc/
/usr/share/doc/libvirt-dev/
/usr/share/doc/libvirt-dev/copyright
/usr/include/
/usr/include/libvirt/
/usr/include/libvirt/libvirt-lxc.h
/usr/include/libvirt/virterror.h
/usr/include/libvirt/libvirt-qemu.h
/usr/include/libvirt/libvirt.h
/usr/lib/libvirt-lxc.so
/usr/lib/libvirt-qemu.so
/usr/lib/libvirt.so
/usr/share/doc/libvirt-dev/README
/usr/share/doc/libvirt-dev/TODO
/usr/share/doc/libvirt-dev/NEWS.gz
/usr/share/doc/libvirt-dev/AUTHORS.gz
/usr/share/doc/libvirt-dev/changelog.Debian.gz