`BuiltinContainerBuilder` not found

[CurlyBraceTT]

I have installed MessagePipe using nuget for unity successfully and my code is able to use type like GlobalMessagePipe, but I can't see BuiltinContainerBuilder from you example and source code

using MessagePipe;

public class MessagePipeStartup
{
    private static void Initialize()
    {
        //var builder = new BuiltinContainerBuilder(); // Can't find BuiltinContainerBuilder error
        var test = GlobalMessagePipe.IsInitialized; // Works fine
    }
}

Unity verison 2022.3.15f1.0.19416

[CurlyBraceTT]

Nvm, installing this via nuget was a mistake, misread installation notes, it works if installed via Package Manager