extern unsigned long fgPlatformSystemTime(void);
extern void fgPlatformSleepForEvents(long msec);
extern void fgPlatformMainLoopPreliminaryWork(void);
extern unsigned long fgPlatformSystemTime(void);
extern void fgPlatformSleepForEvents(long msec);
extern void fgPlatformMainLoopPreliminaryWork(void);