Ruby Gem install Json fails on Mavericks and Xcode 5.1 - unknown argument: '-multiply_definedsuppress'

Question

I was trying run gem install json and got the following error

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /System/Library/Framewo         


        

Answer 1

Paul Chechetin's one-liner doesn't appear to work anymore (9/21/15). However, this reply to the post mentioned in Pete's reply solved the problem for me:

• (a) Install Apple's XCode, then (b) launch it and accept the licensing terms (I had done (a), but not (b).)
• sudo gem uninstall compass
• sudo gem install compass