Where should the *.so file be placed for the program to accept it?

Question

Qt

In the console I collected a self-written program. I'm trying to run, writes what libqjson.so wants. I built this library and installed it earlier via make && make install, everything went well here, the files physically fit in /usr/lib/qjson/
I did everything on QT

Answer 1

Do it first
Then put the built library in one of the folders located in PATH, or add your path /usr/lib/qjson to the specified environment variable.

Answer 2

Everything is said in doc.qt.io/qt-5/deployment.html

Answer 3

5th qt has its own classes for working with json without any third-party libqjson