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diff --git a/extern/bullet2/BulletDynamics/ConstraintSolver/btJacobianEntry.h b/extern/bullet2/BulletDynamics/ConstraintSolver/btJacobianEntry.h
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--- a/extern/bullet2/BulletDynamics/ConstraintSolver/btJacobianEntry.h
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-/*
-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 JACOBIAN_ENTRY_H
-#define JACOBIAN_ENTRY_H
-
-#include "LinearMath/btVector3.h"
-#include "BulletDynamics/Dynamics/btRigidBody.h"
-
-
-//notes:
-// Another memory optimization would be to store m_1MinvJt in the remaining 3 w components
-// which makes the btJacobianEntry memory layout 16 bytes
-// if you only are interested in angular part, just feed massInvA and massInvB zero
-
-/// Jacobian entry is an abstraction that allows to describe constraints
-/// it can be used in combination with a constraint solver
-/// Can be used to relate the effect of an impulse to the constraint error
-ATTRIBUTE_ALIGNED16(class) btJacobianEntry
-{
-public:
-	btJacobianEntry() {};
-	//constraint between two different rigidbodies
-	btJacobianEntry(
-		const btMatrix3x3& world2A,
-		const btMatrix3x3& world2B,
-		const btVector3& rel_pos1,const btVector3& rel_pos2,
-		const btVector3& jointAxis,
-		const btVector3& inertiaInvA, 
-		const btScalar massInvA,
-		const btVector3& inertiaInvB,
-		const btScalar massInvB)
-		:m_linearJointAxis(jointAxis)
-	{
-		m_aJ = world2A*(rel_pos1.cross(m_linearJointAxis));
-		m_bJ = world2B*(rel_pos2.cross(-m_linearJointAxis));
-		m_0MinvJt	= inertiaInvA * m_aJ;
-		m_1MinvJt = inertiaInvB * m_bJ;
-		m_Adiag = massInvA + m_0MinvJt.dot(m_aJ) + massInvB + m_1MinvJt.dot(m_bJ);
-
-		btAssert(m_Adiag > btScalar(0.0));
-	}
-
-	//angular constraint between two different rigidbodies
-	btJacobianEntry(const btVector3& jointAxis,
-		const btMatrix3x3& world2A,
-		const btMatrix3x3& world2B,
-		const btVector3& inertiaInvA,
-		const btVector3& inertiaInvB)
-		:m_linearJointAxis(btVector3(btScalar(0.),btScalar(0.),btScalar(0.)))
-	{
-		m_aJ= world2A*jointAxis;
-		m_bJ = world2B*-jointAxis;
-		m_0MinvJt	= inertiaInvA * m_aJ;
-		m_1MinvJt = inertiaInvB * m_bJ;
-		m_Adiag =  m_0MinvJt.dot(m_aJ) + m_1MinvJt.dot(m_bJ);
-
-		btAssert(m_Adiag > btScalar(0.0));
-	}
-
-	//angular constraint between two different rigidbodies
-	btJacobianEntry(const btVector3& axisInA,
-		const btVector3& axisInB,
-		const btVector3& inertiaInvA,
-		const btVector3& inertiaInvB)
-		: m_linearJointAxis(btVector3(btScalar(0.),btScalar(0.),btScalar(0.)))
-		, m_aJ(axisInA)
-		, m_bJ(-axisInB)
-	{
-		m_0MinvJt	= inertiaInvA * m_aJ;
-		m_1MinvJt = inertiaInvB * m_bJ;
-		m_Adiag =  m_0MinvJt.dot(m_aJ) + m_1MinvJt.dot(m_bJ);
-
-		btAssert(m_Adiag > btScalar(0.0));
-	}
-
-	//constraint on one rigidbody
-	btJacobianEntry(
-		const btMatrix3x3& world2A,
-		const btVector3& rel_pos1,const btVector3& rel_pos2,
-		const btVector3& jointAxis,
-		const btVector3& inertiaInvA, 
-		const btScalar massInvA)
-		:m_linearJointAxis(jointAxis)
-	{
-		m_aJ= world2A*(rel_pos1.cross(jointAxis));
-		m_bJ = world2A*(rel_pos2.cross(-jointAxis));
-		m_0MinvJt	= inertiaInvA * m_aJ;
-		m_1MinvJt = btVector3(btScalar(0.),btScalar(0.),btScalar(0.));
-		m_Adiag = massInvA + m_0MinvJt.dot(m_aJ);
-
-		btAssert(m_Adiag > btScalar(0.0));
-	}
-
-	btScalar	getDiagonal() const { return m_Adiag; }
-
-	// for two constraints on the same rigidbody (for example vehicle friction)
-	btScalar	getNonDiagonal(const btJacobianEntry& jacB, const btScalar massInvA) const
-	{
-		const btJacobianEntry& jacA = *this;
-		btScalar lin = massInvA * jacA.m_linearJointAxis.dot(jacB.m_linearJointAxis);
-		btScalar ang = jacA.m_0MinvJt.dot(jacB.m_aJ);
-		return lin + ang;
-	}
-
-	
-
-	// for two constraints on sharing two same rigidbodies (for example two contact points between two rigidbodies)
-	btScalar	getNonDiagonal(const btJacobianEntry& jacB,const btScalar massInvA,const btScalar massInvB) const
-	{
-		const btJacobianEntry& jacA = *this;
-		btVector3 lin = jacA.m_linearJointAxis * jacB.m_linearJointAxis;
-		btVector3 ang0 = jacA.m_0MinvJt * jacB.m_aJ;
-		btVector3 ang1 = jacA.m_1MinvJt * jacB.m_bJ;
-		btVector3 lin0 = massInvA * lin ;
-		btVector3 lin1 = massInvB * lin;
-		btVector3 sum = ang0+ang1+lin0+lin1;
-		return sum[0]+sum[1]+sum[2];
-	}
-
-	btScalar getRelativeVelocity(const btVector3& linvelA,const btVector3& angvelA,const btVector3& linvelB,const btVector3& angvelB)
-	{
-		btVector3 linrel = linvelA - linvelB;
-		btVector3 angvela  = angvelA * m_aJ;
-		btVector3 angvelb  = angvelB * m_bJ;
-		linrel *= m_linearJointAxis;
-		angvela += angvelb;
-		angvela += linrel;
-		btScalar rel_vel2 = angvela[0]+angvela[1]+angvela[2];
-		return rel_vel2 + SIMD_EPSILON;
-	}
-//private:
-
-	btVector3	m_linearJointAxis;
-	btVector3	m_aJ;
-	btVector3	m_bJ;
-	btVector3	m_0MinvJt;
-	btVector3	m_1MinvJt;
-	//Optimization: can be stored in the w/last component of one of the vectors
-	btScalar	m_Adiag;
-
-};
-
-#endif //JACOBIAN_ENTRY_H