/usr/include/msgpack/preprocessor/tuple/ is in libmsgpack-dev 1.4.2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/msgpack/preprocessor/tuple/detail/
/usr/include/msgpack/preprocessor/tuple/detail/is_single_return.hpp
/usr/include/msgpack/preprocessor/tuple/eat.hpp
/usr/include/msgpack/preprocessor/tuple/elem.hpp
/usr/include/msgpack/preprocessor/tuple/enum.hpp
/usr/include/msgpack/preprocessor/tuple/insert.hpp
/usr/include/msgpack/preprocessor/tuple/pop_back.hpp
/usr/include/msgpack/preprocessor/tuple/pop_front.hpp
/usr/include/msgpack/preprocessor/tuple/push_back.hpp
/usr/include/msgpack/preprocessor/tuple/push_front.hpp
/usr/include/msgpack/preprocessor/tuple/rem.hpp
/usr/include/msgpack/preprocessor/tuple/remove.hpp
/usr/include/msgpack/preprocessor/tuple/replace.hpp
/usr/include/msgpack/preprocessor/tuple/reverse.hpp
/usr/include/msgpack/preprocessor/tuple/size.hpp
/usr/include/msgpack/preprocessor/tuple/to_array.hpp
/usr/include/msgpack/preprocessor/tuple/to_list.hpp
/usr/include/msgpack/preprocessor/tuple/to_seq.hpp