I tend to use more than one version of a compiler (installed in separate folders) until I am sure that a new version doesn't introduce problems to an existing project. Thus, I want to install various packages in a certain compiler. How do I tell Package Manager where is the compiler where I want the package to be installed? It's fine for me if I have to edit Windows registry every time I want to install a package. I just don't know what to edit. Where does Package Manager look for a compiler installation?