gem install pg doesn't work on OSX Lion

Question

There are variations of this question bouncing around SO, but none of them seem to have an answer that solves my problem.

I am running OSX Lion (10.7.3). The latest

Answer 1

Thanks to this guy: http://www.computersnyou.com/2025/

On Mavericks using: xcode-select --install (assuming you have installed Xcode from the app store) works.