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diff --git a/extern/bullet/LinearMath/SimdMinMax.h b/extern/bullet/LinearMath/SimdMinMax.h
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+++ b/extern/bullet/LinearMath/SimdMinMax.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 SIMD_MINMAX_H
+#define SIMD_MINMAX_H
+
+template <class T>
+SIMD_FORCE_INLINE const T& SimdMin(const T& a, const T& b) {
+  return b < a ? b : a;
+}
+
+template <class T>
+SIMD_FORCE_INLINE const T& SimdMax(const T& a, const T& b) {
+  return  a < b ? b : a;
+}
+
+template <class T>
+SIMD_FORCE_INLINE void SimdSetMin(T& a, const T& b) {
+    if (a > b) a = b;
+}
+
+template <class T>
+SIMD_FORCE_INLINE void SimdSetMax(T& a, const T& b) {
+    if (a < b) a = b;
+}
+
+#endif