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diff --git a/indra/llmath/llquaternion2.h b/indra/llmath/llquaternion2.h
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+/** 
+ * @file llquaternion2.h
+ * @brief LLQuaternion2 class header file - SIMD-enabled quaternion class
+ *
+ * $LicenseInfo:firstyear=2010&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef	LL_QUATERNION2_H
+#define	LL_QUATERNION2_H
+
+/////////////////////////////
+// LLQuaternion2
+/////////////////////////////
+// This class stores a quaternion x*i + y*j + z*k + w in <x, y, z, w> order
+// (i.e., w in high order element of vector)
+/////////////////////////////
+/////////////////////////////
+// These classes are intentionally minimal right now. If you need additional
+// functionality, please contact someone with SSE experience (e.g., Falcon or
+// Huseby).
+/////////////////////////////
+#include "llquaternion.h"
+
+class LLQuaternion2
+{
+public:
+
+	//////////////////////////
+	// Ctors
+	//////////////////////////
+	
+	// Ctor
+	LLQuaternion2() {}
+
+	// Ctor from LLQuaternion
+	explicit LLQuaternion2( const class LLQuaternion& quat );
+
+	//////////////////////////
+	// Get/Set
+	//////////////////////////
+
+	// Load from an LLQuaternion
+	inline void operator=( const LLQuaternion& quat )
+	{
+		mQ.loadua( quat.mQ );
+	}
+
+	// Return the internal LLVector4a representation of the quaternion
+	inline const LLVector4a& getVector4a() const;
+	inline LLVector4a& getVector4aRw();
+
+	/////////////////////////
+	// Quaternion modification
+	/////////////////////////
+	
+	// Set this quaternion to the conjugate of src
+	inline void setConjugate(const LLQuaternion2& src);
+
+	// Renormalizes the quaternion. Assumes it has nonzero length.
+	inline void normalize();
+
+	// Quantize this quaternion to 8 bit precision
+	inline void quantize8();
+
+	// Quantize this quaternion to 16 bit precision
+	inline void quantize16();
+
+	/////////////////////////
+	// Quaternion inspection
+	/////////////////////////
+
+	// Return true if this quaternion is equal to 'rhs'. 
+	// Note! Quaternions exhibit "double-cover", so any rotation has two equally valid
+	// quaternion representations and they will NOT compare equal.
+	inline bool equals(const LLQuaternion2& rhs, F32 tolerance = F_APPROXIMATELY_ZERO ) const;
+
+	// Return true if all components are finite and the quaternion is normalized
+	inline bool isOkRotation() const;
+
+protected:
+
+	LLVector4a mQ;
+
+};
+
+#endif