Set unmanaged DLL load directory

I need to load a library from a specific directory. Instead of using specific functions like LoadLibrary (Windows) or dlopen (Linux) I would like to temporary add this folder to the search path.

So I have:

public static void AddOrUpdateDllPath(string dllDirectory)
    {
        dllDirectory = dllDirectory.NormalizePathDelimiters("");

        var path = "";
        switch (RunningPlatform)
        { 
            case OperatingSystem.Windows:
                path = "PATH";
                Environment.SetEnvironmentVariable(path, Environment.GetEnvironmentVariable(path) + ";" + dllDirectory);
                break;
            case OperatingSystem.MacOS:
                path = "LD_LIBRARY_PATH";
                throw new NotImplementedException("How to change " + path);
                break;
            case OperatingSystem.Linux:
                path = "DYLD_FRAMEWORK_PATH";
                throw new NotImplementedException("How to change " + path);
                break;
        }
    }

I dont not know how to add the path variable for Linux and MaxOS ?

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