Dan Benjamin writes: "What follows are updated instructions for manually building and installing Ruby, Ruby on Rails, MySQL, and LightTPD on Mac OS X 10.4 (Tiger). Compiling and installing these tools this way is well worth the effort, as the end result delivers an easy-to-upgrade, system-independent, stand-alone development platform that is impervious to potential problems that can be caused by system updates, operating system upgrades, etc."