#ifndef __NR_perf_event_open
#if defined(__PPC__)
#define __NR_perf_event_open 319
#elif defined(__i386__)
#define __NR_perf_event_open 336
#elif defined(__x86_64__)
#define __NR_perf_event_open 298
#else
#error __NR_perf_event_open must be defined
#endif
#endif