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diff --git a/dep/include/zthread/FastMutex.h b/dep/include/zthread/FastMutex.h
deleted file mode 100644
index e41f34d98e1..00000000000
--- a/dep/include/zthread/FastMutex.h
+++ /dev/null
@@ -1,112 +0,0 @@
-/*
- * Copyright (c) 2005, Eric Crahen
- *
- * 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 __ZTFASTMUTEX_H__
-#define __ZTFASTMUTEX_H__
-
-#include "zthread/Lockable.h"
-#include "zthread/NonCopyable.h"
-
-namespace ZThread {
-
-  class FastLock;
-
-  /**
-   * @class FastMutex
-   * @author Eric Crahen <http://www.code-foo.com>
-   * @date <2003-07-19T18:45:39-0400>
-   * @version 2.2.0
-   *
-   * A FastMutex is a small fast implementation of a non-recursive, mutually exclusive
-   * Lockable object. This implementation is a bit faster than the other Mutex classes
-   * as it involved the least overhead. However, this slight increase in speed is
-   * gained by sacrificing the robustness provided by the other classes.
-   *
-   * A FastMutex has the useful property of not being interruptable; that is to say
-   * that acquire() and tryAcquire() will not throw Interrupted_Exceptions.
-   *
-   * @see Mutex
-   *
-   * <b>Scheduling</b>
-   *
-   * Scheduling is left to the operating systems and may vary.
-   *
-   * <b>Error Checking</b>
-   *
-   * No error checking is performed, this means there is the potential for deadlock.
-   */
-  class ZTHREAD_API FastMutex : public Lockable, private NonCopyable {
-
-    FastLock* _lock;
-
-  public:
-
-    //! Create a FastMutex
-    FastMutex();
-
-    //! Destroy a FastMutex
-    virtual ~FastMutex();
-
-    /**
-     * Acquire exclusive access to the mutex. The calling thread will block until the
-     * lock can be acquired. No safety or state checks are performed.
-     *
-     * @pre The calling thread should <i>not</i> have previously acquired this lock.
-     *      Deadlock will result if the same thread attempts to acquire the mutex more
-     *      than once.
-     *
-     * @post The calling thread obtains the lock successfully if no exception is thrown.
-     * @exception Interrupted_Exception never thrown
-     */
-    virtual void acquire();
-
-    /**
-     * Release exclusive access. No safety or state checks are performed.
-     *
-     * @pre the caller should have previously acquired this lock
-     */
-    virtual void release();
-
-    /**
-     * Try to acquire exclusive access to the mutex. The calling thread will block until the
-     * lock can be acquired. No safety or state checks are performed.
-     *
-     * @pre The calling thread should <i>not</i> have previously acquired this lock.
-     *      Deadlock will result if the same thread attempts to acquire the mutex more
-     *      than once.
-     *
-     * @param timeout unused
-     * @return
-     * - <em>true</em> if the lock was acquired
-     * - <em>false</em> if the lock was acquired
-     *
-     * @post The calling thread obtains the lock successfully if no exception is thrown.
-     * @exception Interrupted_Exception never thrown
-     */
-    virtual bool tryAcquire(unsigned long timeout);
-
-  }; /* FastMutex */
-
-};
-
-#endif // __ZTFASTMUTEX_H__
-