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diff --git a/extern/bullet2/BulletDynamics/ConstraintSolver/btSolverConstraint.h b/extern/bullet2/BulletDynamics/ConstraintSolver/btSolverConstraint.h
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+++ b/extern/bullet2/BulletDynamics/ConstraintSolver/btSolverConstraint.h
@@ -0,0 +1,96 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef BT_SOLVER_CONSTRAINT_H
+#define BT_SOLVER_CONSTRAINT_H
+
+class	btRigidBody;
+#include "LinearMath/btVector3.h"
+#include "LinearMath/btMatrix3x3.h"
+#include "btJacobianEntry.h"
+
+//#define NO_FRICTION_TANGENTIALS 1
+#include "btSolverBody.h"
+
+
+///1D constraint along a normal axis between bodyA and bodyB. It can be combined to solve contact and friction constraints.
+ATTRIBUTE_ALIGNED64 (struct)	btSolverConstraint
+{
+	BT_DECLARE_ALIGNED_ALLOCATOR();
+
+	btVector3		m_relpos1CrossNormal;
+	btVector3		m_contactNormal;
+
+	btVector3		m_relpos2CrossNormal;
+	//btVector3		m_contactNormal2;//usually m_contactNormal2 == -m_contactNormal
+
+	btVector3		m_angularComponentA;
+	btVector3		m_angularComponentB;
+	
+	mutable btSimdScalar	m_appliedPushImpulse;
+	mutable btSimdScalar	m_appliedImpulse;
+	
+	
+	btScalar	m_friction;
+	btScalar	m_jacDiagABInv;
+	union
+	{
+		int	m_numConsecutiveRowsPerKernel;
+		btScalar	m_unusedPadding0;
+	};
+
+	union
+	{
+		int			m_frictionIndex;
+		btScalar	m_unusedPadding1;
+	};
+	union
+	{
+		btRigidBody*	m_solverBodyA;
+		btScalar	m_unusedPadding2;
+	};
+	union
+	{
+		btRigidBody*	m_solverBodyB;
+		btScalar	m_unusedPadding3;
+	};
+	
+	union
+	{
+		void*		m_originalContactPoint;
+		btScalar	m_unusedPadding4;
+	};
+
+	btScalar		m_rhs;
+	btScalar		m_cfm;
+	btScalar		m_lowerLimit;
+	btScalar		m_upperLimit;
+
+	btScalar		m_rhsPenetration;
+
+	enum		btSolverConstraintType
+	{
+		BT_SOLVER_CONTACT_1D = 0,
+		BT_SOLVER_FRICTION_1D
+	};
+};
+
+typedef btAlignedObjectArray<btSolverConstraint>	btConstraintArray;
+
+
+#endif //BT_SOLVER_CONSTRAINT_H
+
+
+