Thanks to the dedicated work of lead developer Axel Dörfler, the Haiku network stack has started taking its first baby steps. After this commit [1], Axel himself and several others have reported successfully running the Vision IRC client in Haiku. Setting up the network requires editing a couple of configuration files, but it should be fairly straighforward for those brave enought to give it a try; Axel explains how to do it here [2].
Great work Axel!