octaviotrindade, i was wrong giving you question "did you installed libqt4-webkit", because libqt4-webkit is bundled in pr1.3
afaik, digia use qt4 release 4.7, and was compiled before pr1.3 out. that's why digia include libqt4-webkit 4.7 in its package.
better wait the next release, unless you wanna get unpredictable consequences