Building Plone.4-3.14 gives "need more than 0 values to unpack"

Question

When running buildout with the Plone-4.3.14-version-configs, the errors below are thrown.

Getting distribution for 'feedparser==5.0.1'.
error: Not a recognized archive type: /tmp/tmpuOPdYIget_dist/feedparser-5.0.1.tar.bz2
An error occurred when trying to install /tmp/tmpuOPdYIget_dist/feedparser-5.0.1.tar.bz2. Look above this message for any errors that were output by easy_install.
While:
  Installing instance.
  Getting distribution for 'feedparser==5.0.1'.

An internal error occurred due to a bug in either zc.buildout or in a
recipe being used:
Traceback (most recent call last):
  File "/home/ida/.virtenv/lib/python2.7/site-packages/zc/buildout/buildout.py", line 2127, in main
    getattr(buildout, command)(args)
  File "/home/ida/.virtenv/lib/python2.7/site-packages/zc/buildout/buildout.py", line 797, in install
    installed_files = self[part]._call(recipe.install)
  File "/home/ida/.virtenv/lib/python2.7/site-packages/zc/buildout/buildout.py", line 1557, in _call
    return f()
  File "/home/ida/.buildout/eggs/plone.recipe.zope2instance-4.2.22-py2.7.egg/plone/recipe/zope2instance/__init__.py", line 114, in install
    installed.extend(self.install_scripts())
  File "/home/ida/.buildout/eggs/plone.recipe.zope2instance-4.2.22-py2.7.egg/plone/recipe/zope2instance/__init__.py", line 618, in install_scripts
    requirements, ws = self.egg.working_set(['plone.recipe.zope2instance'])
  File "/home/ida/.buildout/eggs/zc.recipe.egg-1.3.2-py2.7.egg/zc/recipe/egg/egg.py", line 101, in working_set
    **kw)
  File "/home/ida/.virtenv/lib/python2.7/site-packages/zc/buildout/easy_install.py", line 924, in install
    return installer.install(specs, working_set)
  File "/home/ida/.virtenv/lib/python2.7/site-packages/zc/buildout/easy_install.py", line 726, in install
    for dist in self._get_dist(req, ws):
  File "/home/ida/.virtenv/lib/python2.7/site-packages/zc/buildout/easy_install.py", line 570, in _get_dist
    dists = [_move_to_eggs_dir_and_compile(dist, self._dest)]
  File "/home/ida/.virtenv/lib/python2.7/site-packages/zc/buildout/easy_install.py", line 1704, in _move_to_eggs_dir_and_compile
    [tmp_loc] = glob.glob(os.path.join(tmp_dest, '*'))
ValueError: need more than 0 values to unpack

Answer 1

Took a moment to figure out why, because the explanation does not lie in the last error-message, but the preceding one: Not a recognized archive type, which hints that easy_install cannot handle bunzip-files.

It means that the required sys-package bzip-devel was not present when installing Python. So one must either install that package and install Python again, or in this case also commenting out the pin for feedparser lets the build run without errors.

Afterwards noticed that feedparser is not in the eggs-cache-dir, as it used to be in another build with same versions-configs. At a glance cannot tell the difference why, but the errors are resolved.