Compile error: Latest master db0C1B8

[Willem Ferguson]

Any easy way of getting past this?

compiling qt-ui/metrics.cpp
compiling qt-ui/preferences.cpp
qt-ui/preferences.cpp:13:25: fatal error: QJsonDocument: No such file or 
directory
  #include <QJsonDocument>
                          ^
compilation terminated.
make: *** [.obj/preferences.o] Error 1

Kind regards,
willem