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

In my case, I actually have similar problem, but not on the system ruby, but on rubies installed by rvm from OSX 10.8, and it has issues after upgrading to OSX 10.9.

A simple reinstall works: rvm reinstall ruby-2.1.1