From: Tom Wardrop <tom@...>
Date: 2011-11-28T08:32:28+09:00
Subject: Re: 1.9.3 fails to install via rvm on OS X Lion

I struggled with this also. I eventually just resorted to installing 
osx-gcc-installer over the top of Xcode 4.2 which seems to have worked. 
All the other work arounds like --with-gcc=clang didn't work for me.

Here's where you can find osx-gcc-installer: 
https://github.com/kennethreitz/osx-gcc-installer/downloads

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