andrea@centurion:~/Documents/sviluppo/unity-2d$ make
[  0%] Building CXX object libunity-2d-private/src/CMakeFiles/unity-2d-private.dir/keyboardmodifiersmonitor.cpp.o
In file included from /home/andrea/Documents/sviluppo/unity-2d/libunity-2d-private/src/keyboardmodifiersmonitor.h:26:0,
                 from /home/andrea/Documents/sviluppo/unity-2d/libunity-2d-private/src/keyboardmodifiersmonitor.cpp:23:
/home/andrea/Documents/sviluppo/unity-2d/libunity-2d-private/src/unity2dapplication.h:38:33: error: ‘XEvent’ has not been declared
/home/andrea/Documents/sviluppo/unity-2d/libunity-2d-private/src/unity2dapplication.h:66:25: error: ‘XEvent’ has not been declared
In file included from /home/andrea/Documents/sviluppo/unity-2d/libunity-2d-private/src/keyboardmodifiersmonitor.cpp:23:0:
/home/andrea/Documents/sviluppo/unity-2d/libunity-2d-private/src/keyboardmodifiersmonitor.h:56:25: error: ‘XEvent’ has not been declared
/home/andrea/Documents/sviluppo/unity-2d/libunity-2d-private/src/keyboardmodifiersmonitor.cpp:83:6: error: prototype for ‘bool KeyboardModifiersMonitor::x11EventFilter(XEvent*)’ does not match any in class ‘KeyboardModifiersMonitor’
/home/andrea/Documents/sviluppo/unity-2d/libunity-2d-private/src/keyboardmodifiersmonitor.h:56:10: error: candidate is: virtual bool KeyboardModifiersMonitor::x11EventFilter(int*)
make[2]: *** [libunity-2d-private/src/CMakeFiles/unity-2d-private.dir/keyboardmodifiersmonitor.cpp.o] Error 1
make[1]: *** [libunity-2d-private/src/CMakeFiles/unity-2d-private.dir/all] Error 2
make: *** [all] Error 2