Ruby 1.9.3 on OSX 10.7 (Lion)
It’s been causing nothing but headaches, trying to install 1.9.3 or any newer versions of 1.9.2, ever since upgrading to Lion.
Finally, after a few failed attempts and several stackoverflow threads later, this article surfaces and wouldn’t you know; it seemed to get the job done.
Good job, author of that blog. Your work has been most helpful!