Compile on Debian Linux fails

[j0kiesmurf]

In file included from src/qt/bitcoingui.cpp:41:0:
src/qt/tradingdialog.h:15:23: fatal error: QJsonObject: No such file or directory
#include
^
compilation terminated.
Makefile:1960: recipe for target 'build/bitcoingui.o' failed
make: *** [build/bitcoingui.o] Error 1