Error: 'xslt-config' is not recognized as an internal or external command
make sure the development packages of libxml2 and libxslt are installed

If you are getting this message when trying to pip install lxml or install lxml via Pycharm project interpreter, here the solution https://www.bikrammann.com/error-microsoft-visual-c-10-0-is-required-unable-to-find-vcvarsall-bat/