preparing to build tox from sources

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diff --git a/libs/pthreads/src/pthread_barrierattr_destroy.c b/libs/pthreads/src/pthread_barrierattr_destroy.c
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+/*
+ * pthread_barrier_attr_destroy.c
+ *
+ * Description:
+ * This translation unit implements barrier primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      Pthreads-win32 - POSIX Threads Library for Win32
+ *      Copyright(C) 1998 John E. Bossom
+ *      Copyright(C) 1999,2005 Pthreads-win32 contributors
+ * 
+ *      Contact Email: rpj@callisto.canberra.edu.au
+ * 
+ *      The current list of contributors is contained
+ *      in the file CONTRIBUTORS included with the source
+ *      code distribution. The list can also be seen at the
+ *      following World Wide Web location:
+ *      http://sources.redhat.com/pthreads-win32/contributors.html
+ * 
+ *      This library is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU Lesser General Public
+ *      License as published by the Free Software Foundation; either
+ *      version 2 of the License, or (at your option) any later version.
+ * 
+ *      This library is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *      Lesser General Public License for more details.
+ * 
+ *      You should have received a copy of the GNU Lesser General Public
+ *      License along with this library in the file COPYING.LIB;
+ *      if not, write to the Free Software Foundation, Inc.,
+ *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "pthread.h"
+#include "implement.h"
+
+
+int
+pthread_barrierattr_destroy (pthread_barrierattr_t * attr)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      Destroys a barrier attributes object. The object can
+      *      no longer be used.
+      *
+      * PARAMETERS
+      *      attr
+      *              pointer to an instance of pthread_barrierattr_t
+      *
+      *
+      * DESCRIPTION
+      *      Destroys a barrier attributes object. The object can
+      *      no longer be used.
+      *
+      *      NOTES:
+      *              1)      Does not affect barrieres created using 'attr'
+      *
+      * RESULTS
+      *              0               successfully released attr,
+      *              EINVAL          'attr' is invalid.
+      *
+      * ------------------------------------------------------
+      */
+{
+  int result = 0;
+
+  if (attr == NULL || *attr == NULL)
+    {
+      result = EINVAL;
+    }
+  else
+    {
+      pthread_barrierattr_t ba = *attr;
+
+      *attr = NULL;
+      free (ba);
+    }
+
+  return (result);
+}				/* pthread_barrierattr_destroy */