buildout can't find pip packages for Plone

Question

I'm trying to add add-ons to Plone through buildout but it can't find the packages. I've tried it in a virtualenv andd the system wide python

I followed the set up on the Plone site Setup instructions

Every add-on I try brings up the following error

Installing instance.
/home/a/Plone/zinstance/local/lib/python2.7/site-packages/pkg_resources/__init__.py:192: RuntimeWarning: You have iterated over the result of pkg_resources.parse_version. This is a legacy behavior which is inconsistent with the new version class introduced in setuptools 8.0. In most cases, conversion to a tuple is unnecessary. For comparison of versions, sort the Version instances directly. If you have another use case requiring the tuple, please file a bug with the setuptools project describing that need.
  stacklevel=1,
Couldn't find index page for 'collective.addthis' (maybe misspelled?)
Getting distribution for 'collective.addthis'.
Couldn't find index page for 'collective.addthis' (maybe misspelled?)
While:
  Installing instance.
  Getting distribution for 'collective.addthis'.
Error: Couldn't find a distribution for 'collective.addthis'.

I add the packages to the buildout.cnfg

eggs =
Plone
Pillow
collective.addthis

Plone and Pillow build fine but every add-on I try brings up the same error.

Answer 1

there have been a lot of similar problems reported on https://community.plone.org/

the problem most probably is the migration from in pypi.python.org to pypi.org

you can add:

index = https://pypi.org/simple/

and if you are using allowed hosts you need 2 new ones and can skip *.python.org:

allow-hosts =
    pypi.org
    files.pythonhosted.org

alternatively you can use a current versions of setuptools and zc.buildout

attention: for setuptools > 38.7.0 you need to pin

plone.recipe.zope2instance = 4.4.0

(see https://github.com/plone/plone.recipe.zope2instance/blob/4.4.0/CHANGES.rst)