Another alternative is that you find some more alternatives
find / -type f -name libqt-mt.so*
This might give you some files like libqt-mt.so.1, libqt-mt.so.2, e.t.c.
Lets say, you get some file like libqt-mt.so.1, now you can simply make a soft link of that file
ln -s libqt-mt.so.1 libqt-mt.so.3
This might not work in every scenario, but generally this works.