/usr/include/camp/detail/ is in libcamp0.7-dev 0.7.1.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/camp/detail/arraypropertyimpl.hpp
/usr/include/camp/detail/arraypropertyimpl.inl
/usr/include/camp/detail/callhelper.hpp
/usr/include/camp/detail/classmanager.hpp
/usr/include/camp/detail/constructorimpl.hpp
/usr/include/camp/detail/enummanager.hpp
/usr/include/camp/detail/enumpropertyimpl.hpp
/usr/include/camp/detail/enumpropertyimpl.inl
/usr/include/camp/detail/functionimpl.hpp
/usr/include/camp/detail/functiontraits.hpp
/usr/include/camp/detail/getter.hpp
/usr/include/camp/detail/getter.inl
/usr/include/camp/detail/issmartpointer.hpp
/usr/include/camp/detail/objectholder.hpp
/usr/include/camp/detail/objectholder.inl
/usr/include/camp/detail/objecttraits.hpp
/usr/include/camp/detail/observernotifier.hpp
/usr/include/camp/detail/propertyfactory.hpp
/usr/include/camp/detail/rawtype.hpp
/usr/include/camp/detail/returntype.hpp
/usr/include/camp/detail/simplepropertyimpl.hpp
/usr/include/camp/detail/simplepropertyimpl.inl
/usr/include/camp/detail/typeid.hpp
/usr/include/camp/detail/userpropertyimpl.hpp
/usr/include/camp/detail/userpropertyimpl.inl
/usr/include/camp/detail/valueimpl.hpp
/usr/include/camp/detail/valueprovider.hpp
/usr/include/camp/detail/yesnotype.hpp