Cannot update OpenSSL for Python3

[Cecil Westerhof]

Op Monday 4 May 2015 14:14 CEST schreef Chris Angelico:

> On Mon, May 4, 2015 at 9:32 PM, Cecil Westerhof <Cecil at decebal.nl> wrote:
>>> Does 'pip3 install -U pyOpenSSL' work?
>> Not really, because that gives: Requirement already up-to-date:
>> pyOpenSSL in /usr/lib64/python3.4/site-packages Cleaning up...
>
> I don't know why it wasn't automatically installed, but 'six' is a
> listed dependency of pyOpenSSL. What happens if you try to install
> six?

That gets installed. And then I get:
    ImportError: No module named 'cryptography'

So I try to install that. This gives:
    Command /usr/bin/python3 -c "import setuptools, tokenize;__file__='/tmp/pip_build_root/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-_7jexj87-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /tmp/pip_build_root/cryptography
Storing debug log for failure in /root/.pip/pip.log

In the log I see:
    c/_cffi_backend.c:2:20: fatal error: Python.h: No such file or directory
     #include <Python.h>
                        ^

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof