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diff --git a/extern/bullet/Bullet/NarrowPhaseCollision/SimplexSolverInterface.h b/extern/bullet/Bullet/NarrowPhaseCollision/SimplexSolverInterface.h
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+++ b/extern/bullet/Bullet/NarrowPhaseCollision/SimplexSolverInterface.h
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+/*
+ * Copyright (c) 2005 Erwin Coumans http://www.erwincoumans.com
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies.
+ * Erwin Coumans makes no representations about the suitability 
+ * of this software for any purpose.  
+ * It is provided "as is" without express or implied warranty.
+*/
+
+
+#ifndef SIMPLEX_SOLVER_INTERFACE_H
+#define SIMPLEX_SOLVER_INTERFACE_H
+
+#include "SimdVector3.h"
+#include "SimdPoint3.h"
+
+#define NO_VIRTUAL_INTERFACE
+#ifdef NO_VIRTUAL_INTERFACE
+#include "VoronoiSimplexSolver.h"
+#define SimplexSolverInterface VoronoiSimplexSolver
+#else
+/// for simplices from 1 to 4 vertices
+/// for example Johnson-algorithm or alternative approaches based on
+/// voronoi regions or barycentric coordinates
+class SimplexSolverInterface
+{
+	public:
+		virtual ~SimplexSolverInterface() {};
+
+	virtual void reset() = 0;
+
+	virtual void addVertex(const SimdVector3& w, const SimdPoint3& p, const SimdPoint3& q) = 0;
+	
+	virtual bool closest(SimdVector3& v) = 0;
+
+	virtual SimdScalar maxVertex() = 0;
+
+	virtual bool fullSimplex() const = 0;
+
+	virtual int getSimplex(SimdPoint3 *pBuf, SimdPoint3 *qBuf, SimdVector3 *yBuf) const = 0;
+
+	virtual bool inSimplex(const SimdVector3& w) = 0;
+	
+	virtual void backup_closest(SimdVector3& v) = 0;
+
+	virtual bool emptySimplex() const = 0;
+
+	virtual void compute_points(SimdPoint3& p1, SimdPoint3& p2) = 0;
+
+	virtual int numVertices() const =0;
+
+
+};
+#endif
+#endif //SIMPLEX_SOLVER_INTERFACE_H
+