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diff --git a/src/lib/mathlib/math/Quaternion.hpp b/src/lib/mathlib/math/Quaternion.hpp
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+/****************************************************************************
+ *
+ *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file Quaternion.hpp
+ *
+ * math quaternion lib
+ */
+
+#pragma once
+
+#include "Vector.hpp"
+#include "Matrix.hpp"
+
+namespace math
+{
+
+class Dcm;
+class EulerAngles;
+
+class __EXPORT Quaternion : public Vector
+{
+public:
+
+	/**
+	 * default ctor
+	 */
+	Quaternion();
+
+	/**
+	 * ctor from floats
+	 */
+	Quaternion(float a, float b, float c, float d);
+
+	/**
+	 * ctor from data
+	 */
+	Quaternion(const float *data);
+
+	/**
+	 * ctor from Vector
+	 */
+	Quaternion(const Vector &v);
+
+	/**
+	 * ctor from EulerAngles
+	 */
+	Quaternion(const EulerAngles &euler);
+
+	/**
+	 * ctor from Dcm
+	 */
+	Quaternion(const Dcm &dcm);
+
+	/**
+	 * deep copy ctor
+	 */
+	Quaternion(const Quaternion &right);
+
+	/**
+	 * dtor
+	 */
+	virtual ~Quaternion();
+
+	/**
+	 * derivative
+	 */
+	Vector derivative(const Vector &w);
+
+	/**
+	 * accessors
+	 */
+	void setA(float a) { (*this)(0) = a; }
+	void setB(float b) { (*this)(1) = b; }
+	void setC(float c) { (*this)(2) = c; }
+	void setD(float d) { (*this)(3) = d; }
+	const float &getA() const { return (*this)(0); }
+	const float &getB() const { return (*this)(1); }
+	const float &getC() const { return (*this)(2); }
+	const float &getD() const { return (*this)(3); }
+};
+
+int __EXPORT quaternionTest();
+} // math
+