diff -rN -u old-stream-engine/src/stream-engine-main.c new-stream-engine/src/stream-engine-main.c
--- old-stream-engine/src/stream-engine-main.c  2006-08-11 16:00:16.000000000 +0200
+++ new-stream-engine/src/stream-engine-main.c  2006-08-11 16:00:16.000000000 +0200
@@ -83,9 +83,12 @@
   memset(&schedp, 0x00, sizeof(schedp));
   schedp.sched_priority = sched_get_priority_min(prio_policy) + prio_delta;
   /* 0 pid equals to getpid() ie. current process */
+#if defined(__APPLE__) && defined(__MACH__)
+#else
   if (sched_setscheduler(0, prio_policy, &schedp) == -1) {
     perror("sched_setscheduler()");
   }
+#endif
   /* nail everything to RAM, needed for realtime on systems with swap,
    * also avoids extra calls to vm subsystem */
   /*if (mlockall(MCL_CURRENT|MCL_FUTURE) == -1) {