我有这个问题太（通过MacPorts的编译器遇到的）。 X $ C $的c previous版本将让你通过X code / preferences安装的命令行工具，但X code5并没有给在GUI中的命令行工具选项，所以我认为它是自动现已列入。尝试运行此命令：

I had this problem too (encountered through Macports compilers). Previous versions of Xcode would let you install command line tools through xcode/Preferences, but xcode5 doesn't give a command line tools option in the GUI, that so I assumed it was automatically included now. Try running this command:

xcode-select --install