Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?

building 'lxml.etree' extension
creating build/temp.linux-x86_64-2.7
creating build/temp.linux-x86_64-2.7/src
creating build/temp.linux-x86_64-2.7/src/lxml
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -Isrc/lxml/includes -I/usr/include/python2.7 -c src/lxml/lxml.etree.c -o build/temp.linux-x86_64-2.7/src/lxml/lxml.etree.o -w
In file included from src/lxml/lxml.etree.c:320:0:
src/lxml/includes/etree_defs.h:14:31: fatal error: libxml/xmlversion.h: 没有那个文件或目录
compilation terminated.
Compile failed: command 'gcc' failed with exit status 1
cc -I/usr/include/libxml2 -c /tmp/xmlXPathInitshtn_t.c -o tmp/xmlXPathInitshtn_t.o
/tmp/xmlXPathInitshtn_t.c:1:26: fatal error: libxml/xpath.h: 没有那个文件或目录
compilation terminated.
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Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?
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error: command 'gcc' failed with exit status 1