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diff --git a/dep/include/zthread/Waitable.h b/dep/include/zthread/Waitable.h
deleted file mode 100644
index c5cae314b46..00000000000
--- a/dep/include/zthread/Waitable.h
+++ /dev/null
@@ -1,95 +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 __ZTWAITABLE_H__
-#define __ZTWAITABLE_H__
-
-#include "zthread/Exceptions.h"
-
-namespace ZThread {
-
-  /**
-   * @class Waitable
-   *
-   * @author Eric Crahen <http://www.code-foo.com>
-   * @date <2003-07-16T22:16:41-0400>
-   * @version 2.3.0
-   *
-   * The Waitable interface defines a common method of adding generic <i>wait</i> semantics
-   * to a class.
-   *
-   * <b>Waiting</b>
-   *
-   * An object implementing the Waitable interface externalizes a mechanism for testing
-   * some internal condition. Another object may <i>wait()</i>s for a Waitable object;
-   * in doing so, it wait()s for that condition to become true by blocking the caller
-   * while the condition is false.
-   *
-   * For example, a Condition is Waitable object that extends <i>wait</i> semantics
-   * so that wait()ing means a thread is blocked until some external stimulus
-   * specifically performs an operation on the Condition to make its internal condition true.
-   * (serialization aside)
-   *
-   * A Barrier extends <i>wait</i> semantics so that wait()ing mean waiting for other
-   * waiters, and may include automatically resetting the condition once a wait is complete.
-   *
-   * @see Condition
-   * @see Barrier
-   * @see Executor
-   */
-  class Waitable {
-  public:
-
-    //! Destroy a Waitable object.
-    virtual ~Waitable() {}
-
-    /**
-     * Waiting on an object will generally cause the calling thread to be blocked
-     * for some indefinite period of time. The thread executing will not proceed
-     * any further until the Waitable object releases it unless or an exception
-     * is thrown.
-     */
-    virtual void wait() = 0;
-
-    /**
-     * Waiting on an object will generally cause the calling thread to be blocked
-     * for some indefinite period of time. The thread executing will not proceed
-     * any further until the Waitable object releases it unless or an exception
-     * is thrown.
-     *
-     * @param timeout maximum amount of time, in milliseconds, to spend waiting.
-     *
-     * @return
-     *   - <em>true</em> if the set of tasks being wait for complete before
-     *                   <i>timeout</i> milliseconds elapse.
-     *   - <em>false</em> othewise.
-     */
-    virtual bool wait(unsigned long timeout) = 0;
-
-
-  }; /* Waitable */
-
-
-} // namespace ZThread
-
-#endif //  __ZTWAITABLE_H__
-