要死了， pip install lxml 老是错误，求解答

gcc: 内部错误：已杀死 (程序 cc1)
请提交一份完整的错误报告。
具体步骤请参见 <http://bugzilla.redhat.com/bugzilla>。
Compile failed: command 'gcc' failed with exit status 1
cc -I/usr/include/libxml2 -I/usr/include/libxml2 -c /tmp/xmlXPathInit2n9hsr8u.c -o tmp/xmlXPathInit2n9hsr8u.o
cc tmp/xmlXPathInit2n9hsr8u.o -L/usr/lib64 -lxml2 -o a.out
error: command 'gcc' failed with exit status 1

----------------------------------------
Command "/usr/local/bin/python3.5 -c "import setuptools, tokenize;__file__='/tmp/pip-build-naxwm8_v/lxml/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-pm50syyl-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-naxwm8_v/lxml
[root@vps ~]# pip list
beautifulsoup4 (4.4.1)
pip (7.1.2)
setuptools (19.2)
wheel (0.26.0)
[root@vps ~]#