1 files changed, 7 insertions, 0 deletions
diff --git a/src/gui/kernel/qhighdpiscaling_p.h b/src/gui/kernel/qhighdpiscaling_p.h
index 31d1cfe784..189f31fd0a 100644
--- a/src/gui/kernel/qhighdpiscaling_p.h
+++ b/src/gui/kernel/qhighdpiscaling_p.h
@@ -114,6 +114,10 @@ private:
     static QVector<ScreenFactor> m_screenFactors;
     static DpiAdjustmentPolicy m_dpiAdjustmentPolicy;
     static QHash<QString, qreal> m_namedScreenScaleFactors;
+
+#ifndef QT_NO_DEBUG_STREAM
+    friend Q_GUI_EXPORT QDebug operator<<(QDebug, const ScreenFactor &);
+#endif
 };
 
 namespace QHighDpi {
@@ -344,6 +348,9 @@ public:
 
 namespace QHighDpi {
     template <typename T> inline
+    T scale(const T &value, ...) { return value; }
+
+    template <typename T> inline
     T toNative(const T &value, ...) { return value; }
     template <typename T> inline
     T fromNative(const T &value, ...) { return value; }