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

Installing xcode from the app store is not enough. You will also need xcode's command line tools. https://developer.apple.com/library/ios/#documentation/DeveloperTools/Conceptual/WhatsNewXcode/Articles/xcode_4_3.html

After installing xcode from the app store, open xcode. Goto Xcode->Open Developer Tool->More Developer Tools Download and install the latest command line tools.

Open a terminal window and run: sudo gem install pg