brew doctor
时,我遇到了这个错误。
Warning: Your compilers are different from the standard versions for your Xcode.
If you have Xcode 4.3 or newer, you should install the Command Line Tools for
Xcode from within Xcode's Download preferences.
Otherwise, you should reinstall Xcode.
我已经多次重新安装了Xcode,并每次重新安装了CLI工具。