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diff -wrupN mathgl-2.3/json/Backend.hpp mathgl-2.3-new/json/Backend.hpp
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--- mathgl-2.3/json/Backend.hpp	2014-08-07 14:12:37.000000000 +0200
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+++ mathgl-2.3-new/json/Backend.hpp	2015-07-26 22:48:50.750733852 +0200
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@@ -1,5 +1,6 @@
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 #pragma once
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+#include <QObject>
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 #include <QStringList>
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 class Backend : public QObject