diff -r 56cd8111b7f7 -r 41300fa6a67c src/corelib/tools/qbytearray.h
--- a/src/corelib/tools/qbytearray.h	Tue Jan 26 12:42:25 2010 +0200
+++ b/src/corelib/tools/qbytearray.h	Tue Feb 02 00:43:10 2010 +0200
@@ -572,7 +572,7 @@
 { return setNum(double(n),f,prec); }
 
 
-#ifndef QT_NO_DATASTREAM
+#if !defined(QT_NO_DATASTREAM) || (defined(QT_BOOTSTRAPPED) && !defined(QT_BUILD_QMAKE))
 Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QByteArray &);
 Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QByteArray &);
 #endif