commit ce14cfda34175b6456a8cc7d1e336dce2b0b0682
Author: Mihai Moldovan <ionic@ionic.de>
Date:   Thu Jul 5 08:52:18 2018 +0200

    src/printwidget.cpp: add QButtonGroup include, fixes compile errors with Qt 5.11+.

diff --git a/src/printwidget.cpp b/src/printwidget.cpp
index 58a8af7..131d340 100644
--- a/src/printwidget.cpp
+++ b/src/printwidget.cpp
@@ -23,6 +23,7 @@
 #include "x2gosettings.h"
 #include "x2gologdebug.h"
 #include <QDir>
+#include <QButtonGroup>
 #ifdef Q_OS_WIN
 #include "wapi.h"
 #endif