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diff -up octave-4.2.2/libgui/src/settings-dialog.cc.orig octave-4.2.2/libgui/src/settings-dialog.cc
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--- octave-4.2.2/libgui/src/settings-dialog.cc.orig	2018-02-28 11:41:44.000000000 -0700
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+++ octave-4.2.2/libgui/src/settings-dialog.cc	2018-06-02 14:09:38.138706993 -0600
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@@ -36,6 +36,7 @@ along with Octave; see the file COPYING.
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 #include <QHash>
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 #include <QMessageBox>
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 #include <QTextCodec>
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+#include <QButtonGroup>
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 #if defined (HAVE_QSCINTILLA)
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 #  include "octave-qscintilla.h"