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diff --git a/cryptominisat5/cryptominisat-5.6.3/src/nomutex.h b/cryptominisat5/cryptominisat-5.6.3/src/nomutex.h
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+/******************************************
+Copyright (c) 2016, Mate Soos
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+***********************************************/
+
+#ifndef NO_MUTEX_H
+#define NO_MUTEX_H
+
+namespace std {
+    struct mutex {
+        void lock() {}
+        void unlock() {}
+    };
+
+    static const bool memory_order_relaxed = true;
+    static const bool memory_order_acquire = true;
+
+    inline void atomic_thread_fence(bool)
+    {}
+
+    template<class T>
+    struct atomic {
+        atomic()
+        {}
+
+        atomic(bool _val) :
+        val(_val)
+        {}
+
+        void store(bool _val, bool) {
+            val = _val;
+        }
+        bool load(bool) const {
+            return val;
+        }
+        operator bool() {
+            return val;
+        }
+        T val;
+    };
+}
+
+#endif //NO_MUTEX_H