When a friend of mine upgraded to Ubuntu 6.06 and along with that (unwillingly) to
Apache 2.2.x, I decided to compile the latest Apache-version from source on my
PowerBook G4 running the Tiger. Read the article for full instruction including compiling PHP 5 from source and creating a launchd-item to start the new Apache on boot.
Rafael: Thank you very much, I was having a huge headache to solve the very same problem!