'How to build and install' XEmacs webpage

Hello, as everybody knows some things have changed from XEmacs 20.4 and this is true for building and installing XEmacs as well. When XEmacs 21.0 is released a lot of people might get into trouble facing the changes. To avoid FAQs on 'How to build XEmacs on XXX?' I would like create some webpage which contain descriptions of the build and install process for all the architecture/OS combinations we are supporting with the current release of XEmaxs. As I am willing to do this I need help since I don't have access to all supportted systems and of cource I don't about every trap and pitfall. Thus, I would appreciate some help and ask everybody a description how to build XEmacs on his box from scratch (please attach the Installation file). Remember to include all information about tools (e.g make, sed), patches we needed to be installed/upgraded before building XEmacs. Especially I need Information to build XEmacs on NT. I think it will safe us some reasonable amount of time if we put these pages on the web soon. --Marcus