/usr/include/ is in libdbus-c++-dev 0.9.0-8ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dbus-c++-1/dbus-c++/
/usr/include/dbus-c++-1/
/usr/include/dbus-c++-1/dbus-c++/glib-integration.h
/usr/include/dbus-c++-1/dbus-c++/util.h
/usr/include/dbus-c++-1/dbus-c++/debug.h
/usr/include/dbus-c++-1/dbus-c++/interface.h
/usr/include/dbus-c++-1/dbus-c++/api.h
/usr/include/dbus-c++-1/dbus-c++/error.h
/usr/include/dbus-c++-1/dbus-c++/eventloop-integration.h
/usr/include/dbus-c++-1/dbus-c++/object.h
/usr/include/dbus-c++-1/dbus-c++/pendingcall.h
/usr/include/dbus-c++-1/dbus-c++/property.h
/usr/include/dbus-c++-1/dbus-c++/types.h
/usr/include/dbus-c++-1/dbus-c++/dbus.h
/usr/include/dbus-c++-1/dbus-c++/message.h
/usr/include/dbus-c++-1/dbus-c++/refptr_impl.h
/usr/include/dbus-c++-1/dbus-c++/connection.h
/usr/include/dbus-c++-1/dbus-c++/introspection.h
/usr/include/dbus-c++-1/dbus-c++/eventloop.h
/usr/include/dbus-c++-1/dbus-c++/server.h
/usr/include/dbus-c++-1/dbus-c++/dispatcher.h
/usr/include/dbus-c++-1/dbus-c++/pipe.h