Are you sure you are trying to install the correct package? The version that is in extras-devel installs and runs. Btw, it doesn't depend on libqtcore4 (that package is named "libqt4-core" in Fremantle).

Before telling the extras-devel entry settings please note that you should be careful when installing stuff from extras-devel since the apps there can be more or less unstable causing unexpected issues. You have been warned.

The correct entry for extras-devel is:
Address: http://repository.maemo.org/extras-devel/
Distribution: fremantle
Components: free