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diff --git a/dep/include/zthread/Time.h b/dep/include/zthread/Time.h
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+/*
+ * 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 __ZTTIME_H__
+#define __ZTTIME_H__
+
+#include "zthread/Config.h"
+
+namespace ZThread {
+
+/**
+ * @class Time
+ * @author Eric Crahen <http://www.code-foo.com>
+ * @date <2003-07-16T17:52:46-0400>
+ * @version 2.2.11
+ *
+ * The Time class provides access to time values relative to when the program
+ * was started. In other words, this class might be thought of as a timer that
+ * starts at 0 and counts upwards. This class offers millisecond resolution.
+ */
+class ZTHREAD_API Time {
+
+  unsigned long _seconds;
+  unsigned long _milliseconds;
+
+  //! Create a new Time object
+  Time(unsigned long secs, unsigned long millis)
+    : _seconds(secs), _milliseconds(millis) { }
+
+  /**
+   * Set the number of milliseconds in this Time object.
+   *
+   * @param millis - new milliseconds value
+   * @return unsigned long old milliseconds value
+   */
+  unsigned long milliseconds(unsigned long millis) {
+
+    unsigned long n = _milliseconds;
+    _milliseconds = millis;
+
+    return n;
+
+  }
+
+  /**
+   * Set the number of seconds in this Time object.
+   *
+   * @param secs - new seconds value
+   * @return unsigned long old seconds value
+   */
+  unsigned long seconds(unsigned long secs) {
+
+    unsigned long n = _seconds;
+    _seconds = secs;
+
+    return n;
+
+  }
+
+ public:
+
+
+  /**
+   * Create a Time object with the current time relative to the
+   * beginning of the program.
+   */
+  Time();
+
+  /**
+   * Create a Time object by copying another.
+   *
+   * @param t - Time object to copy.
+   */
+  Time(const Time& t)
+    : _seconds(t._seconds), _milliseconds(t._milliseconds) { }
+
+
+  /**
+   * Get the number of milliseconds in this Time object.
+   *
+   * @return unsigned long milliseconds value
+   */
+  unsigned long milliseconds() const {
+    return _milliseconds;
+  }
+
+  /**
+   * Get the number of seconds in this Time object.
+   *
+   * @return unsigned long seconds value
+   */
+  unsigned long seconds() const {
+    return _seconds;
+  }
+
+  /**
+   * Add some number of milliseconds to this Time object.
+   *
+   * @param millis - number of milliseconds to add to this Time object
+   * @return const Time& this object
+   */
+  const Time& operator+=(unsigned long millis) {
+
+    _milliseconds += millis;
+    _seconds += (_milliseconds / 1000);
+    _milliseconds %= 1000;
+
+    return *this;
+
+  }
+
+  /**
+   * Subtract some number of milliseconds to this Time object.
+   *
+   * @param millis - number of milliseconds to subtract from this Time object
+   * @return const Time& this object
+   */
+const Time& operator-=(unsigned long millis) {
+
+    if(_milliseconds > millis)
+      _milliseconds -= millis;
+
+    else {
+
+      while(_seconds > 0 && _milliseconds < millis) {
+
+        _milliseconds += 1000;
+        _seconds -= 1;
+
+      }
+
+      _milliseconds = (_milliseconds < millis) ? 0 : (_milliseconds - millis);
+
+    }
+
+    return *this;
+
+}
+
+
+  /**
+   * Add the value of another Time object to this one.
+   *
+   * @param t - Time object whose value should be added to this object
+   * @return const Time& this object
+   */
+  const Time& operator+=(const Time& t) {
+
+    _milliseconds += t.milliseconds();
+    _seconds += (_milliseconds / 1000) + t.seconds();
+    _milliseconds %= 1000;
+
+    return *this;
+
+  }
+
+  /**
+   * Subtract the value of another Time object from this one.
+   * This function has a floor of 0.
+   *
+   * @param t - Time object whose value should be subtracted from this object
+   * @return const Time& this object
+   */
+const Time& operator-=(const Time& t) {
+
+  unsigned long millis = t.milliseconds();
+  unsigned long secs = t.seconds();
+
+  if(_seconds >= secs) {
+
+    if(_milliseconds > millis) {
+      _milliseconds -= millis;
+      _seconds -= secs;
+
+    } else {
+
+      while(_seconds > 0 && _milliseconds < millis) {
+
+        _milliseconds += 1000;
+        _seconds -= 1;
+
+      }
+
+      _milliseconds = (_milliseconds < millis) ? 0 : (_milliseconds - millis);
+      _seconds = (_seconds < secs) ? 0 : (_seconds - secs);
+
+    }
+
+  } else {
+
+    _milliseconds = 0;
+    _seconds = 0;
+
+  }
+
+  return *this;
+
+}
+
+};
+
+
+
+} // namespace ZThread
+
+#endif // __ZTTIME_H__