Uh oh, right. In theory libsdl-ttf2.0-0 (<= 2.0.9-1maemo2) should have never made it into extras in its current form. In practice, it's there now and there is no clean upgrade path to 2.0.9-1maemo3 yet. I'll try and remove the SDL_ttf dependency from Frogatto to fix this. You have to remove libsdl-ttf2.0-0 first, explanation here. List all your installed packages with dpkg -l or dpkg --get-selections and look for unneeded packages. Check the dependencies of frogatto-engine (and their dependencies) to see what was installed with it.