Cannot install channels

[Robin Lery]

Hi,

I already had a django channels in my other virtual env. But since its an older version of channels (0.7.0) I am trying to install a new channel version into my project which is in a different virtual environment inside a a vagrant box.

I created a new virtualenv

$ mkvirtualenv newsapp

Install django

$ pip install django

Install channels

$ pip install -U channels

Then I am getting error:

Command "/home/vagrant/Envs/newsapp/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-IrzQ_E/twisted/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-ArjPse-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/vagrant/Envs/newsapp/include/site/python2.7/twisted" failed with error code 1 in /tmp/pip-build-IrzQ_E/twisted/

Here is link for the full error

Can you please help how to solve this issue?

[Andrew Godwin]

You don't have the Python development headers installed for your system - you can tell this because of this line in the error:

src/twisted/test/raiser.c:4:20: fatal error: Python.h: No such file or directory

If you install your distribution's python header package (e.g. on ubuntu it's python-dev) it should resolve the error.

Andrew

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[Robin Lery]

Yes that was it. Thank you. Could you please help me understand why this might have worked before in a earlier different virtual env in the same vagrant machine?

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[Andrew Godwin]

I'm afraid I can't help without looking at the machine directly - I would suspect that either it had a version of Twisted pre-installed on the system that it was happy with (the more recent releases increased the Twisted version requirement), or the version of Twisted it downloaded did not require compilation.

Andrew

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[Robin Lery]

Yes. That might have been the problem. Thank you once again!

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[David W]

I would add that the required package could be "python3.6-dev" if you're working with Python 3.6.

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