Command "/usr/bin/python -c " 
import setuptools, tokenize;
__file__='/tmp/pip-build-vR_zHb/lxml/setup.py';
exec(compile(getattr(tokenize, 'open', open) 
(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install 
--record /tmp/pip-hnGH2o-record/install-record.txt 
--single-version-externally-managed --compile" 


failed with error code 1 in /tmp/pip-build-vR_zHb/lxml