--- a
+++ b/src/c/threads/ecl_atomics.h
@@ -0,0 +1,30 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+/*
+    ecl_atomics.h -- alternative definitions for atomic operations
+*/
+/*
+    Copyright (c) 2012, Juan Jose Garcia Ripoll.
+
+    ECL is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    See file '../Copyright' for full details.
+*/
+
+#ifndef ECL_ATOMICS_H
+#define AO_ASSUME_WINDOWS98
+#include <ecl/atomic_ops.h>
+
+#if !defined(AO_HAVE_compare_and_swap_full)
+# error "ECL needs AO_compare_and_swap_full or an equivalent"
+#endif
+#if !defined(AO_HAVE_compare_and_swap)
+# error "ECL needs AO_compare_and_swap or an equivalent"
+#endif
+#if !defined(AO_HAVE_fetch_and_add1)
+# error "Cannot implement mailboxs without AO_fetch_and_add1"
+#endif
+
+#endif /* ECL_ATOMICS_H */