--- octave-4.4.0-orig/libgui/src/settings-dialog.cc	2018-05-01 03:03:56.000000000 +1000
+++ octave-4.4.0/libgui/src/settings-dialog.cc	2018-07-03 19:35:41.865149269 +1000
@@ -41,6 +41,7 @@
 #include <QHash>
 #include <QMessageBox>
 #include <QTextCodec>
+#include <QButtonGroup>
 
 #if defined (HAVE_QSCINTILLA)
 #  include "octave-qscintilla.h"
