Well, if you read the big fat warning in the output, then it's clear that lxml cannot be built because you do not have the library dependencies installed. See the installation instructions, or just wait for Py3.7 to be released, as I'll probably provide binary wheels then.
Well, if you read the big fat warning in the output, then it's clear that lxml cannot be built because you do not have the library dependencies installed. See the installation instructions, or just wait for Py3.7 to be released, as I'll probably provide binary wheels then.