libraries installed in wrong directory

[heeplr]

Currently uconfig always installs its libraries into /usr/lib/ on *nix OSs. This fails on some distributions that differ between /usr/lib, /usr/lib32 and /usr/lib64

I'm not too familiar with qmake hence I'm not sure how it gets the correct library install path so I can't send a PR that is sure to work cleanly. Or if it's possible at all (I suppose it is).

Desktop (please complete the following information):

• OS: gentoo
• Version 17.0/systemd
• Qt Version: 5.12.5

[sebcaux]

I'm not familiar with make install.
Could you please give me the conditions of using /usr/lib, /usr/lib32 and /usr/lib64 ?
I will implement it inside the pro file.