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diff --git a/extern/bullet/Bullet/CollisionDispatch/UnionFind.h b/extern/bullet/Bullet/CollisionDispatch/UnionFind.h
deleted file mode 100644
index 8705e579189..00000000000
--- a/extern/bullet/Bullet/CollisionDispatch/UnionFind.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
-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 UNION_FIND_H
-#define UNION_FIND_H
-
-///UnionFind calculates connected subsets
-// Implements weighted Quick Union with path compression
-// optimization: could use short ints instead of ints (halving memory, would limit the number of rigid bodies to 64k, sounds reasonable)
-class UnionFind
-  {
-    private:
-		int*	m_id;
-		int*	m_sz;
-		int m_N;
-
-    public:
-		int find(int x);
-	  
-		UnionFind();
-		~UnionFind();
-
-	  void	reset(int N);
-
-	  inline int	getNumElements() const
-	  {
-		  return m_N;
-	  }
-	  inline bool  isRoot(int x) const
-	  {
-		  return (x == m_id[x]);
-	  }
-
-      int find(int p, int q);
-      void unite(int p, int q);
-
-	  void	Allocate(int N);
-	  void	Free();
-
-  };
-
-
-#endif //UNION_FIND_H