まえがき 新しくこしらえたMacBookでRubyの「gem install json」をしたところ Building native extensions. This could take a while... ERROR: Error installing json: ERROR: Failed to build gem native extension. /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb creating Makefile make "DESTDIR=" compiling generator.c linking shared-object json/ext/generator.bundle clang: error: unknown argument: '-mu
![Mac Marvericks × Xcode5.1の環境でgem installができない!! | メモ帳代わりのブログ](https://cdn-ak-scissors.b.st-hatena.com/image/square/e63b55377ca066db53a99d9146b9e72fd9538823/height=288;version=1;width=512/http%3A%2F%2Fwww.absolute-keitarou.net%2Fblog%2Fwp-content%2Fuploads%2F2014%2F03%2F41CGDEMgyoL._SL160_-125x150.jpg)