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diff --git a/extern/bullet2/BulletCollision/Gimpact/gim_bitset.h b/extern/bullet2/BulletCollision/Gimpact/gim_bitset.h
new file mode 100644
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--- /dev/null
+++ b/extern/bullet2/BulletCollision/Gimpact/gim_bitset.h
@@ -0,0 +1,123 @@
+#ifndef GIM_BITSET_H_INCLUDED
+#define GIM_BITSET_H_INCLUDED
+/*! \file gim_bitset.h
+\author Francisco Len Nßjera
+*/
+/*
+-----------------------------------------------------------------------------
+This source file is part of GIMPACT Library.
+
+For the latest info, see http://gimpact.sourceforge.net/
+
+Copyright (c) 2006 Francisco Leon Najera. C.C. 80087371.
+email: projectileman@yahoo.com
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of EITHER:
+   (1) The GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 2.1 of the License, or (at
+       your option) any later version. The text of the GNU Lesser
+       General Public License is included with this library in the
+       file GIMPACT-LICENSE-LGPL.TXT.
+   (2) The BSD-style license that is included with this library in
+       the file GIMPACT-LICENSE-BSD.TXT.
+   (3) The zlib/libpng license that is included with this library in
+       the file GIMPACT-LICENSE-ZLIB.TXT.
+
+ 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 files
+ GIMPACT-LICENSE-LGPL.TXT, GIMPACT-LICENSE-ZLIB.TXT and GIMPACT-LICENSE-BSD.TXT for more details.
+
+-----------------------------------------------------------------------------
+*/
+
+#include "gim_array.h"
+
+
+#define GUINT_BIT_COUNT 32
+#define GUINT_EXPONENT 5
+
+class gim_bitset
+{
+public:
+    gim_array<GUINT> m_container;
+
+    gim_bitset()
+    {
+
+    }
+
+    gim_bitset(GUINT bits_count)
+    {
+        resize(bits_count);
+    }
+
+    ~gim_bitset()
+    {
+    }
+
+	inline bool resize(GUINT newsize)
+	{
+		GUINT oldsize = m_container.size();
+		m_container.resize(newsize/GUINT_BIT_COUNT + 1,false);
+		while(oldsize<m_container.size())
+		{
+			m_container[oldsize] = 0;
+		}
+		return true;
+	}
+
+	inline GUINT size()
+	{
+		return m_container.size()*GUINT_BIT_COUNT;
+	}
+
+	inline void set_all()
+	{
+		for(GUINT i = 0;i<m_container.size();++i)
+		{
+			m_container[i] = 0xffffffff;
+		}
+	}
+
+	inline void clear_all()
+	{
+	    for(GUINT i = 0;i<m_container.size();++i)
+		{
+			m_container[i] = 0;
+		}
+	}
+
+	inline void set(GUINT bit_index)
+	{
+		if(bit_index>=size())
+		{
+			resize(bit_index);
+		}
+		m_container[bit_index >> GUINT_EXPONENT] |= (1 << (bit_index & (GUINT_BIT_COUNT-1)));
+	}
+
+	///Return 0 or 1
+	inline char get(GUINT bit_index)
+	{
+		if(bit_index>=size())
+		{
+			return 0;
+		}
+		char value = m_container[bit_index >> GUINT_EXPONENT] &
+					 (1 << (bit_index & (GUINT_BIT_COUNT-1)));
+		return value;
+	}
+
+	inline void clear(GUINT bit_index)
+	{
+	    m_container[bit_index >> GUINT_EXPONENT] &= ~(1 << (bit_index & (GUINT_BIT_COUNT-1)));
+	}
+};
+
+
+
+
+
+#endif // GIM_CONTAINERS_H_INCLUDED