/usr/include/smbios/config/ is in libsmbios-dev 2.3.1-1+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/smbios/config/README
/usr/include/smbios/config/abi/
/usr/include/smbios/config/abi/msvc_prefix.hpp
/usr/include/smbios/config/abi/msvc_suffix.hpp
/usr/include/smbios/config/abi_prefix.hpp
/usr/include/smbios/config/abi_suffix.hpp
/usr/include/smbios/config/auto_link.hpp
/usr/include/smbios/config/compiler/
/usr/include/smbios/config/compiler/gcc.hpp
/usr/include/smbios/config/compiler/sunpro_cc.hpp
/usr/include/smbios/config/compiler/visualc.hpp
/usr/include/smbios/config/platform/
/usr/include/smbios/config/platform/linux.hpp
/usr/include/smbios/config/platform/solaris.hpp
/usr/include/smbios/config/platform/win32.hpp
/usr/include/smbios/config/platform/win64.hpp
/usr/include/smbios/config/posix_features.hpp
/usr/include/smbios/config/select_compiler_config.hpp
/usr/include/smbios/config/select_platform_config.hpp
/usr/include/smbios/config/select_stdlib_config.hpp
/usr/include/smbios/config/stdlib/
/usr/include/smbios/config/stdlib/libstdcpp2.hpp
/usr/include/smbios/config/stdlib/libstdcpp3.hpp
/usr/include/smbios/config/suffix.hpp
/usr/include/smbios/config/user.hpp