I have an old Qt project I would like to compile for a local use, and it need an external library: openssl, the old v1 version.
I have installed the package, and the extension is stored in /usr/lib/x86_64-linux-gnu, I can see the .so file and the correct linking:
libssl.so -> libssl.so.3
However, as you can see it, it is a more recent version of the library that the one actually needed in my project. Therefore I got the older version and put it in /usr/local/lib.
The compilation fails, because of the "too recent" version of the library. If I remove it, it succeeds because Qt seems to fallback in the other folder and take the older one.
My issue is that I need both versions, the most recent one by default, and the older one just to compile this project.
I did not manage to tell Qmake to try first the old version. In Qt, I tried to add the library as an external one, but the most recent version is still used. I also tried manually after reading some posts here, here and here or here.
I noticed that each post and the Qt assistant use the += operator, which might cause that this override is not taken into account because the default library has already been found?
I use Qt 5.9.9.
