I'm replying to myself 😉
Following plenty of newsgroups, I stumbled onto a fellow who said he'd got things up and running via downloading the source for apache, mm, & php4 and then building each into a debian package. Building apache & mm was easy via apt-get source package --build, but doing the same for php4 presented some depedency conflicts that apt-get build-deps would not handle. Finally, I was able to build it & install it. Seems to be working like a champ.
Great fun!
