Finally waited !!! Qt for Maemo officially supported package with a bunch of fixes. What does it mean ??? Now you can officially develop applications using Qt. Moreover, the integration with Maemo has improved and many errors and omissions have been fixed.
The new release is supported only in the scratchbox SDK, since MADDE is still in beta. But still, MADDE supports the new release; to install, you need to install the package in rootstrap as on the device.