#include <android/input.h>
#include <android/native_window.h>
+#include <sigc++/trackable.h>
#include <msp/core/mutex.h>
#include "window_private.h"
typedef void *DisplayHandle;
-struct PlatformDisplayPrivate
+struct PlatformDisplayPrivate: public sigc::trackable
{
AInputQueue *input_queue;
std::list<Window::Event> events;