/usr/include/libbonobo-2.0/bonobo/ is in libbonobo2-dev 2.24.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libbonobo-2.0/bonobo/Bonobo.h
/usr/include/libbonobo-2.0/bonobo/bonobo-app-client.h
/usr/include/libbonobo-2.0/bonobo/bonobo-application.h
/usr/include/libbonobo-2.0/bonobo/bonobo-arg.h
/usr/include/libbonobo-2.0/bonobo/bonobo-context.h
/usr/include/libbonobo-2.0/bonobo/bonobo-event-source.h
/usr/include/libbonobo-2.0/bonobo/bonobo-exception.h
/usr/include/libbonobo-2.0/bonobo/bonobo-foreign-object.h
/usr/include/libbonobo-2.0/bonobo/bonobo-generic-factory.h
/usr/include/libbonobo-2.0/bonobo/bonobo-i18n.h
/usr/include/libbonobo-2.0/bonobo/bonobo-item-container.h
/usr/include/libbonobo-2.0/bonobo/bonobo-item-handler.h
/usr/include/libbonobo-2.0/bonobo/bonobo-listener.h
/usr/include/libbonobo-2.0/bonobo/bonobo-macros.h
/usr/include/libbonobo-2.0/bonobo/bonobo-main.h
/usr/include/libbonobo-2.0/bonobo/bonobo-moniker-extender.h
/usr/include/libbonobo-2.0/bonobo/bonobo-moniker-simple.h
/usr/include/libbonobo-2.0/bonobo/bonobo-moniker-util.h
/usr/include/libbonobo-2.0/bonobo/bonobo-moniker.h
/usr/include/libbonobo-2.0/bonobo/bonobo-object.h
/usr/include/libbonobo-2.0/bonobo/bonobo-persist-client.h
/usr/include/libbonobo-2.0/bonobo/bonobo-persist-file.h
/usr/include/libbonobo-2.0/bonobo/bonobo-persist-stream.h
/usr/include/libbonobo-2.0/bonobo/bonobo-persist.h
/usr/include/libbonobo-2.0/bonobo/bonobo-property-bag-client.h
/usr/include/libbonobo-2.0/bonobo/bonobo-property-bag.h
/usr/include/libbonobo-2.0/bonobo/bonobo-shlib-factory.h
/usr/include/libbonobo-2.0/bonobo/bonobo-storage-memory.h
/usr/include/libbonobo-2.0/bonobo/bonobo-storage.h
/usr/include/libbonobo-2.0/bonobo/bonobo-stream-client.h
/usr/include/libbonobo-2.0/bonobo/bonobo-stream-memory.h
/usr/include/libbonobo-2.0/bonobo/bonobo-stream.h
/usr/include/libbonobo-2.0/bonobo/bonobo-types.h
/usr/include/libbonobo-2.0/bonobo/bonobo-xobject.h