/usr/include/msgpack/preprocessor/control/ is in libmsgpack-dev 1.4.2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/msgpack/preprocessor/control/deduce_d.hpp
/usr/include/msgpack/preprocessor/control/detail/
/usr/include/msgpack/preprocessor/control/detail/dmc/
/usr/include/msgpack/preprocessor/control/detail/dmc/while.hpp
/usr/include/msgpack/preprocessor/control/detail/edg/
/usr/include/msgpack/preprocessor/control/detail/edg/while.hpp
/usr/include/msgpack/preprocessor/control/detail/msvc/
/usr/include/msgpack/preprocessor/control/detail/msvc/while.hpp
/usr/include/msgpack/preprocessor/control/detail/while.hpp
/usr/include/msgpack/preprocessor/control/expr_if.hpp
/usr/include/msgpack/preprocessor/control/expr_iif.hpp
/usr/include/msgpack/preprocessor/control/if.hpp
/usr/include/msgpack/preprocessor/control/iif.hpp
/usr/include/msgpack/preprocessor/control/while.hpp