/usr/include/gusb-1/ is in libgusb-dev 0.2.11-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gusb-1/gusb/
/usr/include/gusb-1/gusb-private.h
/usr/include/gusb-1/gusb.h
/usr/include/gusb-1/gusb/gusb-autocleanups.h
/usr/include/gusb-1/gusb/gusb-context-private.h
/usr/include/gusb-1/gusb/gusb-context.h
/usr/include/gusb-1/gusb/gusb-device-list.h
/usr/include/gusb-1/gusb/gusb-device-private.h
/usr/include/gusb-1/gusb/gusb-device.h
/usr/include/gusb-1/gusb/gusb-interface-private.h
/usr/include/gusb-1/gusb/gusb-interface.h
/usr/include/gusb-1/gusb/gusb-source.h
/usr/include/gusb-1/gusb/gusb-util.h
/usr/include/gusb-1/gusb/gusb-version.h