事情本来很简单，但是过程中在不断有错误出现。。主要是clang..

开始之前

安装好Xcode以及brew

安装 brew

 ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

安装gevent

需要先安装libevent

 brew install libevent

还需要安装cython

 pip install cython

接着就是greenlet

sudo pip install greenlet

如果可以很幸运的安装gevent

sudo pip install gevent

如果没有的话

安装报错

安装cython报错

 export ARCHFLAGS="-Wno-error=unused-command-line-argument-hard-error-in-future"

安装greenlet报错

 clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
 clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: command 'cc' failed with exit status 1

那么

 sudo ARCHFLAGS="-Wno-error=unused-command-line-argument-hard-error-in-future" pip install greenlet