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diff -up coldet/src/box.h~ coldet/src/box.h
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--- coldet/src/box.h~	2001-02-23 19:08:22.000000000 +0100
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+++ coldet/src/box.h	2011-02-13 19:52:56.049850991 +0100
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@@ -25,6 +25,7 @@
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 #define H_BOX
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 #include <vector>
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+#include <cstddef>
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 #include "math3d.h"
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 #include "sysdep.h"
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