/usr/include/bonobo-activation-2.0/ is in libbonobo2-dev 2.24.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/bonobo-activation-2.0/bonobo-activation/
/usr/include/bonobo-activation-2.0/bonobo-activation/Bonobo_Activation_types.h
/usr/include/bonobo-activation-2.0/bonobo-activation/Bonobo_GenericFactory.h
/usr/include/bonobo-activation-2.0/bonobo-activation/Bonobo_Unknown.h
/usr/include/bonobo-activation-2.0/bonobo-activation/bonobo-activation-activate.h
/usr/include/bonobo-activation-2.0/bonobo-activation/bonobo-activation-async.h
/usr/include/bonobo-activation-2.0/bonobo-activation/bonobo-activation-init.h
/usr/include/bonobo-activation-2.0/bonobo-activation/bonobo-activation-mime.h
/usr/include/bonobo-activation-2.0/bonobo-activation/bonobo-activation-register.h
/usr/include/bonobo-activation-2.0/bonobo-activation/bonobo-activation-server-info.h
/usr/include/bonobo-activation-2.0/bonobo-activation/bonobo-activation-shlib.h
/usr/include/bonobo-activation-2.0/bonobo-activation/bonobo-activation-version.h
/usr/include/bonobo-activation-2.0/bonobo-activation/bonobo-activation.h