I advice everyone to not use the currently packaged qt5 libraries (from webkit or snowshoe). Each of them has their own problems, and they're old snapshots.

Laszlo Papp is currently packaging the newest beta for Harmattan into the community repository. This will give us much better and easier way to go forward with Qt5 development on Harmattan.

See here his blog for details:

http://lpapp.blogspot.ie/2012/08/qt5...harmattan.html

EDIT: Things like Laszlo is doing here is helping everyone using, and developing for, Harmattan. If you have the skills to do some debian packaging work, please consider contributing to the community repository.