/usr/include/boost/dll/ is in libboost1.62-dev 1.62.0+dfsg-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/dll/alias.hpp
/usr/include/boost/dll/detail/
/usr/include/boost/dll/detail/aggressive_ptr_cast.hpp
/usr/include/boost/dll/detail/ctor_dtor.hpp
/usr/include/boost/dll/detail/demangling/
/usr/include/boost/dll/detail/demangling/demangle_symbol.hpp
/usr/include/boost/dll/detail/demangling/itanium.hpp
/usr/include/boost/dll/detail/demangling/mangled_storage_base.hpp
/usr/include/boost/dll/detail/demangling/msvc.hpp
/usr/include/boost/dll/detail/elf_info.hpp
/usr/include/boost/dll/detail/get_mem_fn_type.hpp
/usr/include/boost/dll/detail/import_mangled_helpers.hpp
/usr/include/boost/dll/detail/macho_info.hpp
/usr/include/boost/dll/detail/pe_info.hpp
/usr/include/boost/dll/detail/posix/
/usr/include/boost/dll/detail/posix/path_from_handle.hpp
/usr/include/boost/dll/detail/posix/program_location_impl.hpp
/usr/include/boost/dll/detail/posix/shared_library_impl.hpp
/usr/include/boost/dll/detail/system_error.hpp
/usr/include/boost/dll/detail/type_info.hpp
/usr/include/boost/dll/detail/windows/
/usr/include/boost/dll/detail/windows/path_from_handle.hpp
/usr/include/boost/dll/detail/windows/shared_library_impl.hpp
/usr/include/boost/dll/detail/x_info_interface.hpp
/usr/include/boost/dll/import.hpp
/usr/include/boost/dll/import_class.hpp
/usr/include/boost/dll/import_mangled.hpp
/usr/include/boost/dll/library_info.hpp
/usr/include/boost/dll/runtime_symbol_info.hpp
/usr/include/boost/dll/shared_library.hpp
/usr/include/boost/dll/shared_library_load_mode.hpp
/usr/include/boost/dll/smart_library.hpp