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diff --git a/extern/libmv/libmv/image/tuple.h b/extern/libmv/libmv/image/tuple.h
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+// Copyright (c) 2007, 2008 libmv authors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+
+#ifndef LIBMV_IMAGE_TUPLE_H
+#define LIBMV_IMAGE_TUPLE_H
+
+#include <algorithm>
+
+namespace libmv {
+
+// A vector of elements with fixed lenght and deep copy semantics.
+template <typename T, int N>
+class Tuple {
+ public:
+  enum { SIZE = N };
+  Tuple() {}
+  Tuple(T initial_value) { Reset(initial_value); }
+
+  template <typename D>
+  Tuple(D *values) { Reset(values); }
+
+  template <typename D>
+  Tuple(const Tuple<D,N> &b) { Reset(b); }
+
+  template <typename D>
+  Tuple& operator=(const Tuple<D,N>& b) {
+    Reset(b);
+    return *this;
+  }
+
+  template <typename D>
+  void Reset(const Tuple<D, N>& b) { Reset(b.Data()); }
+
+  template <typename D>
+  void Reset(D *values) {
+    for(int i=0;i<N;i++) {
+      data_[i] = T(values[i]);
+    }
+  }
+
+  // Set all tuple values to the same thing.
+  void Reset(T value) {
+    for(int i=0;i<N;i++) {
+      data_[i] = value;
+    }
+  }
+
+  // Pointer to the first element.
+  T *Data() { return &data_[0]; }
+  const T *Data() const { return &data_[0]; }
+
+  T &operator()(int i) { return data_[i]; }
+  const T &operator()(int i) const { return data_[i]; }
+
+  bool operator==(const Tuple<T, N> &other) const {
+    for (int i = 0; i < N; ++i) {
+      if ((*this)(i) != other(i)) {
+        return false;
+      }
+    }
+    return true;
+  }
+  bool operator!=(const Tuple<T, N> &other) const {
+    return !(*this == other);
+  }
+
+ private:
+  T data_[N];
+};
+
+}  // namespace libmv
+
+#endif  // LIBMV_IMAGE_TUPLE_H