/usr/ is in libnih-dbus-dev 1.0.3-6ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/libnih-dbus.h
/usr/include/nih-dbus/
/usr/include/nih-dbus/dbus_connection.h
/usr/include/nih-dbus/dbus_error.h
/usr/include/nih-dbus/dbus_interface.h
/usr/include/nih-dbus/dbus_message.h
/usr/include/nih-dbus/dbus_object.h
/usr/include/nih-dbus/dbus_pending_data.h
/usr/include/nih-dbus/dbus_proxy.h
/usr/include/nih-dbus/dbus_util.h
/usr/include/nih-dbus/errors.h
/usr/include/nih-dbus/test_dbus.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libnih-dbus.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libnih-dbus-dev