extern "C" int sys_ioprio_set(int, int, int);
extern "C" int sys_ioprio_get(int, int);
-#if defined(__i386__)
-#define __NR_ioprio_set 289
-#define __NR_ioprio_get 290
-#elif defined(__ppc__) || defined(__powerpc__)
-#define __NR_ioprio_set 273
-#define __NR_ioprio_get 274
-#elif defined(__x86_64__)
-#define __NR_ioprio_set 251
-#define __NR_ioprio_get 252
-#elif defined(__ia64__)
-#define __NR_ioprio_set 1274
-#define __NR_ioprio_get 1275
-#elif defined(__mips__)
-#define __NR_ioprio_set 4284
-#define __NR_ioprio_get 4285
-#else
-#error "Unsupported arch"
+#ifndef __NR_ioprio_set
+ #if defined(__i386__)
+ #define __NR_ioprio_set 289
+ #define __NR_ioprio_get 290
+ #elif defined(__ppc__) || defined(__powerpc__)
+ #define __NR_ioprio_set 273
+ #define __NR_ioprio_get 274
+ #elif defined(__x86_64__)
+ #define __NR_ioprio_set 251
+ #define __NR_ioprio_get 252
+ #elif defined(__ia64__)
+ #define __NR_ioprio_set 1274
+ #define __NR_ioprio_get 1275
+ #elif defined(__mips__)
+ #define __NR_ioprio_set 4284
+ #define __NR_ioprio_get 4285
+ #else
+ #error "Unsupported arch"
+ #endif
#endif
#if defined(_syscall3) && defined(_syscall2)