c++ builder compile error after unidac upgrade

c++ builder compile error after unidac upgrade

Using c++ builder xe10.3.2, vcl win32 bits app.
After update from unidac 9.2.1 to unidac 9.4.0 I got a compile error in standard includes:
[bcc32 Error] ws2tcpip.h(604): E2015 Ambiguity between 'std::size_t' and 'Litecalluni::size_t'

Any idea why?