[Dev-luatex] build-latest-code-from-source instructions?

I'm probably being blind, but I can't find any instructions about downloading the source from svn and building it. Can some kind person please point me to such instructions? I want to be sure I'm running current code before I file any "this works in pdftex but not in luatex" reports. Doc -- Web: http://www.sff.net/people/N7DR