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diff --git a/extern/bullet/LinearMath/GEN_List.h b/extern/bullet/LinearMath/GEN_List.h
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+++ b/extern/bullet/LinearMath/GEN_List.h
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+/*
+
+Copyright (c) 2005 Gino van den Bergen / Erwin Coumans <www.erwincoumans.com>
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+
+#ifndef GEN_LIST_H
+#define GEN_LIST_H
+
+class GEN_Link {
+public:
+    GEN_Link() : m_next(0), m_prev(0) {}
+    GEN_Link(GEN_Link *next, GEN_Link *prev) : m_next(next), m_prev(prev) {}
+    
+    GEN_Link *getNext() const { return m_next; }  
+    GEN_Link *getPrev() const { return m_prev; }  
+
+    bool isHead() const { return m_prev == 0; }
+    bool isTail() const { return m_next == 0; }
+
+    void insertBefore(GEN_Link *link) {
+        m_next         = link;
+        m_prev         = link->m_prev;
+        m_next->m_prev = this;
+        m_prev->m_next = this;
+    } 
+
+    void insertAfter(GEN_Link *link) {
+        m_next         = link->m_next;
+        m_prev         = link;
+        m_next->m_prev = this;
+        m_prev->m_next = this;
+    } 
+
+    void remove() { 
+        m_next->m_prev = m_prev; 
+        m_prev->m_next = m_next;
+    }
+
+private:  
+    GEN_Link  *m_next;
+    GEN_Link  *m_prev;
+};
+
+class GEN_List {
+public:
+    GEN_List() : m_head(&m_tail, 0), m_tail(0, &m_head) {}
+
+    GEN_Link *getHead() const { return m_head.getNext(); } 
+    GEN_Link *getTail() const { return m_tail.getPrev(); } 
+
+    void addHead(GEN_Link *link) { link->insertAfter(&m_head); }
+    void addTail(GEN_Link *link) { link->insertBefore(&m_tail); }
+    
+private:
+    GEN_Link m_head;
+    GEN_Link m_tail;
+};
+
+#endif
+
+
+