每当我升级Xcode时，我就会在安装GCC的时候遇到链接错误。

So, I upgraded to Mavericks as well as the newest version of Xcode (5.02), and — as expected, was unable to compile any new Ruby gems which include C extensions. This happens specifically with my own project, NMatrix, which includes C and C++ code.So, I upgraded to Mavericks as well as the newe