环境：阿里云+centos7
安装教程：http://my.oschina.net/leezhen/blog/20696...
但是出现以下问题：
Command "/usr/local/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-_u6TwE/cffi/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-SppGCo-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-_u6TwE/cffi/
请教！