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diff --git a/gcc/ada/thread.c b/gcc/ada/thread.c
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+/****************************************************************************
+ *                                                                          *
+ *                         GNAT COMPILER COMPONENTS                         *
+ *                                                                          *
+ *                               T H R E A D                                *
+ *                                                                          *
+ *                          C Implementation File                           *
+ *                                                                          *
+ *             Copyright (C) 2011, Free Software Foundation, Inc.           *
+ *                                                                          *
+ * GNAT is free software;  you can  redistribute it  and/or modify it under *
+ * terms of the  GNU General Public License as published  by the Free Soft- *
+ * ware  Foundation;  either version 3,  or (at your option) any later ver- *
+ * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
+ * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
+ * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
+ *                                                                          *
+ * As a special exception under Section 7 of GPL version 3, you are granted *
+ * additional permissions described in the GCC Runtime Library Exception,   *
+ * version 3.1, as published by the Free Software Foundation.               *
+ *                                                                          *
+ * You should have received a copy of the GNU General Public License and    *
+ * a copy of the GCC Runtime Library Exception along with this program;     *
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
+ * <http://www.gnu.org/licenses/>.                                          *
+ *                                                                          *
+ * GNAT was originally developed  by the GNAT team at  New York University. *
+ * Extensive contributions were provided by Ada Core Technologies Inc.      *
+ *                                                                          *
+ ****************************************************************************/
+
+/*  This file provides utility functions to access the threads API          */
+
+#include <pthread.h>
+#include <time.h>
+#include "s-oscons.h"
+
+int
+__gnat_pthread_condattr_setup(pthread_condattr_t *attr) {
+/*
+ * If using a clock other than CLOCK_REALTIME for the Ada Monotonic_Clock,
+ * the corresponding clock id must be set for condition variables.
+ * There are no clock_id's on Darwin.
+ */
+#if defined(__APPLE__) || ((CLOCK_RT_Ada) == (CLOCK_REALTIME))
+  return 0;
+#else
+  return pthread_condattr_setclock (attr, CLOCK_RT_Ada);
+#endif
+}