Fix mac build

Add some #if to accomplish this.

Test: mm
Change-Id: I934e805a0b41e172cb419a3648935c6db789ad57
diff --git a/dex2oat/dex2oat.cc b/dex2oat/dex2oat.cc
index ca0c3e3..be75628 100644
--- a/dex2oat/dex2oat.cc
+++ b/dex2oat/dex2oat.cc
@@ -423,12 +423,14 @@
       : timeout_in_milliseconds_(timeout_in_milliseconds),
         shutting_down_(false) {
     const char* reason = "dex2oat watch dog thread startup";
-    pthread_condattr_t condattr;
     CHECK_WATCH_DOG_PTHREAD_CALL(pthread_mutex_init, (&mutex_, nullptr), reason);
+#ifndef __APPLE__
+    pthread_condattr_t condattr;
     CHECK_WATCH_DOG_PTHREAD_CALL(pthread_condattr_init, (&condattr), reason);
     CHECK_WATCH_DOG_PTHREAD_CALL(pthread_condattr_setclock, (&condattr, CLOCK_MONOTONIC), reason);
     CHECK_WATCH_DOG_PTHREAD_CALL(pthread_cond_init, (&cond_, &condattr), reason);
     CHECK_WATCH_DOG_PTHREAD_CALL(pthread_condattr_destroy, (&condattr), reason);
+#endif
     CHECK_WATCH_DOG_PTHREAD_CALL(pthread_attr_init, (&attr_), reason);
     CHECK_WATCH_DOG_PTHREAD_CALL(pthread_create, (&pthread_, &attr_, &CallBack, this), reason);
     CHECK_WATCH_DOG_PTHREAD_CALL(pthread_attr_destroy, (&attr_), reason);
@@ -486,7 +488,11 @@
 
   void Wait() {
     timespec timeout_ts;
+#if defined(__APPLE__)
+    InitTimeSpec(true, CLOCK_REALTIME, timeout_in_milliseconds_, 0, &timeout_ts);
+#else
     InitTimeSpec(true, CLOCK_MONOTONIC, timeout_in_milliseconds_, 0, &timeout_ts);
+#endif
     const char* reason = "dex2oat watch dog thread waiting";
     CHECK_WATCH_DOG_PTHREAD_CALL(pthread_mutex_lock, (&mutex_), reason);
     while (!shutting_down_) {