/usr/include/wxsmith/properties/ is in libwxsmithlib-dev 16.01+dfsg-2+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/wxsmith/properties/wxsarraystringeditordlg.h
/usr/include/wxsmith/properties/wxsarraystringproperty.h
/usr/include/wxsmith/properties/wxsboolproperty.h
/usr/include/wxsmith/properties/wxscustomeditorproperty.h
/usr/include/wxsmith/properties/wxseditenumproperty.h
/usr/include/wxsmith/properties/wxsemptyproperty.h
/usr/include/wxsmith/properties/wxsenumproperty.h
/usr/include/wxsmith/properties/wxsflagsproperty.h
/usr/include/wxsmith/properties/wxsfloatproperty.h
/usr/include/wxsmith/properties/wxslongproperty.h
/usr/include/wxsmith/properties/wxsproperties.h
/usr/include/wxsmith/properties/wxsproperty.h
/usr/include/wxsmith/properties/wxspropertycontainer.h
/usr/include/wxsmith/properties/wxspropertygridmanager.h
/usr/include/wxsmith/properties/wxspropertystream.h
/usr/include/wxsmith/properties/wxsquickpropspanel.h
/usr/include/wxsmith/properties/wxsstringproperty.h