Buildout [SSL: CERTIFICATE_VERIFY_FAILED]

Hello

I've just started using Plone 5.0. Managed to get it installed fine and ran buildout with develop.cfg as suggested. I'm now following the tutorial on building a basic add-on and form. However, re-running develop.cfg with my add-on throws the error below. I'd be really grateful to get some guidance about where to look first.

Thanks

Anne

Updating _mr.developer.
Updating instance.
Updating repozo.
Updating backup.
Updating zopepy.
Updating unifiedinstaller.
Installing test.
Download error on http://pypi.python.org/simple/z3c.jbot/: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590) -- Some packages may not be found!
Couldn't find index page for 'z3c.jbot' (maybe misspelled?)
Download error on http://pypi.python.org/simple/: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590) -- Some packages may not be found!
Getting distribution for 'z3c.jbot'.
Couldn't find index page for 'z3c.jbot' (maybe misspelled?)
While:
Installing test.
Getting distribution for 'z3c.jbot'.
Error: Couldn't find a distribution for 'z3c.jbot'.

This isn't a problem in the code, this is a problem establishing a connection to pypi.python.org

I see the URL says http , and the error is about an SSL certificate -- is it trying to connect to a plaintext server but assuming that it is an https connection? Does wget http://pypi.python.org/simple/z3c.jbot work? (It will redirect to https).