$ pip install Pillow
####出现下面讨厌的报错，不能成功继续安装
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

####解决方法(将出错降级为警告)
$ sudo ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future pip install Pillow