diff -r b72c6db6890b -r 5dc02b23752f src/corelib/tools/qeasingcurve.h
--- a/src/corelib/tools/qeasingcurve.h	Wed Jun 23 19:07:03 2010 +0300
+++ b/src/corelib/tools/qeasingcurve.h	Tue Jul 06 15:10:48 2010 +0300
@@ -100,13 +100,24 @@
     qreal valueForProgress(qreal progress) const;
 private:
     QEasingCurvePrivate *d_ptr;
+#ifndef QT_NO_DEBUG_STREAM
     friend Q_CORE_EXPORT QDebug operator<<(QDebug debug, const QEasingCurve &item);
+#endif
+#ifndef QT_NO_DATASTREAM
+    friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QEasingCurve&);
+    friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QEasingCurve &);
+#endif
 };
 
 #ifndef QT_NO_DEBUG_STREAM
 Q_CORE_EXPORT QDebug operator<<(QDebug debug, const QEasingCurve &item);
 #endif
 
+#ifndef QT_NO_DATASTREAM
+Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QEasingCurve&);
+Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QEasingCurve &);
+#endif
+
 QT_END_NAMESPACE
 
 QT_END_HEADER