src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory

Install libxslt-devel & libxml2-devel using

sudo apt-get install libxml2-dev libxslt1-dev

After installing follow the above one

Install Cython using

easy_install Cython
After completion of cython, install libxslt-devel & libxml2-devel using

yum install libxslt-devel libxml2-devel

This worked for me.

The selected answer is right but I just wanted to add for those who use Fedora: libxslt1 is called libxslt when using dnf. So the command is:

sudo dnf install libxml2-devel libxslt-devel

devel for dnf is the same as dev for apt-get.

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