Link error "undefined reference to `QListData::detach(int)'"

When building this code with the binary Qt 4.7.0-Symbian package...

#include <QtCore>
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    foreach (const QFileInfo &file, QDir().entryInfoList())
        qDebug() << file.fileName();
    return 0;
}

...I get this link error.

/NokiaQtSDK/Symbian/SDK-qt-4.7/EPOC32/BUILD/temp/untitled/UNTITLED_0XE777D02B/GCCE/UREL/main.o: In function `QList<QFileInfo>::detach_helper(int)':
main.cpp.text._ZN5QListI9QFileInfoE13detach_helperEi[_ZN5QListI9QFileInfoE13detach_helperEi]+0x10): undefined reference to `QListData::detach(int)'

I am (97.5%) sure that I was able to build the same code with the binary 4.7-Symbian-beta package. Did we add symbols which we did not export in the .def files?