Qt 4.8 is better than Qt 5.x

I am currently helping a friend doing project on Qt and OpenCV. There're some problem I encounter regarding library dependencies:

I can't build newer OpenCV (2.4.9) against  libavutil.so.52 (ffmpeg-2.1.4), therefore I resorted to Slackbuild's prebuilt OpenCV 2.4.5

I can't compile sanely valid Qt program OpenCV 2.4.5 on Qt 5.2. Which in turn becase OpenCV 2.4.5 is build around Qt 4 (4.8 most likely). I hate this dependency hell.

So here I am, reverting back to Qt 4.8. Good thing Slackware64-current's is Qt 4.8.2.