I was speaking about the fact that Google Earth uses Qt3 and QtWebKit uses Qt4 and there are similar symbol names in both (e.g. QApplication) which could result in Qt4-based code trying to access some calls from Qt4 but really reaching into Qt3 code and crashing because of ending up in bogus binary data. One would have to rebuild Qt4 and QtWebKit using a custom namespace (or similar approach) to avoid symbol clashes. Then it might work.
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