Unresolved external symbols: mqtt::message::DFLT_QOS and mqtt::message::DFLT_RETAINED in x86-windows build (VS2022, C++14)

[Alohaq]

VS2022, C++14, using vcpkg for package management, configured as x86-windows. The following compilation issues occur:

Unresolved external symbol "public: static int const mqtt::message::DFLT_QOS" (?DFLT_QOS@message@mqtt@@2HB).
Unresolved external symbol "public: static bool const mqtt::message::DFLT_RETAINED" (?DFLT_RETAINED@message@mqtt@@2_NB).