Created temporary directory: /tmp/pip-ephem-wheel-cache-x8abzhz3
Created temporary directory: /tmp/pip-req-tracker-8sdk3duw
Created requirements tracker '/tmp/pip-req-tracker-8sdk3duw'
Created temporary directory: /tmp/pip-wheel-wz1b9q0i
Looking in indexes: https://pypi.python.org/simple
Collecting zope.preference==4.1.0
  1 location(s) to search for versions of zope.preference:
  * https://pypi.python.org/simple/zope-preference/
  Getting page https://pypi.python.org/simple/zope-preference/
  Analyzing links from page https://pypi.org/simple/zope-preference/
    Found link https://files.pythonhosted.org/packages/5c/23/3cd5b7334ce1d992d7ebb5e5f6bbbf410ecedf757c51b1949c92d6721a7c/zope.preference-3.8.0.tar.gz#sha256=640fdd16bdbfb2eb1c20370c01aa4e9648eac84448ed6356b7ae6abe115fc829 (from https://pypi.org/simple/zope-preference/), version: 3.8.0
    Found link https://files.pythonhosted.org/packages/43/ff/71dcd8078f0d8954228cd6941814d6e7d8daf3b69671bb7774eacfcf04a9/zope.preference-4.0.0a1.zip#sha256=2151381fca8952c156c50369220ac3080db6ebf8dd5ce6791fa5ed569bdc93fe (from https://pypi.org/simple/zope-preference/), version: 4.0.0a1
    Found link https://files.pythonhosted.org/packages/9f/a6/8d5c32dc07cd843ff30da8e174e9e6546210fba266fa26871ba42759cc27/zope.preference-4.0.0-py2.py3-none-any.whl#sha256=509117eebafce9409216ee8c2c3ca7ca41afac29c630f190f2e1017bfaefabe5 (from https://pypi.org/simple/zope-preference/), version: 4.0.0
    Found link https://files.pythonhosted.org/packages/3c/34/6b5580d2dfa7f186f39c3db0902e5480fcf7703582affda7486f87354e18/zope.preference-4.0.0.tar.gz#sha256=ebfc6238cb0bf77f08f31d2e7a8c5de938bea7030b3c88ab3da55ffea3ee3aa8 (from https://pypi.org/simple/zope-preference/), version: 4.0.0
    Found link https://files.pythonhosted.org/packages/38/1a/5541055a7004dab6e8cb1486b642009cbae37ad8ff728761faf7a44ffc54/zope.preference-4.1.0-py2.py3-none-any.whl#sha256=c833683d90a213e445d2d1263c9ba9935a53088b464dd1dac4ce93cc4d48a0ed (from https://pypi.org/simple/zope-preference/), version: 4.1.0
    Found link https://files.pythonhosted.org/packages/68/5c/d1df0ff39070f2e61590c076334d564467542f85aac260b4a41c9e758871/zope.preference-4.1.0.tar.gz#sha256=d0249ff28297b47718ca92ecf6025536e5b631c8b33b28e16f73cb8cec1f5396 (from https://pypi.org/simple/zope-preference/), version: 4.1.0
  Using version 4.1.0 (newest of versions: 4.1.0)
  Created temporary directory: /tmp/pip-unpack-je0wgb9n
  Downloading https://files.pythonhosted.org/packages/38/1a/5541055a7004dab6e8cb1486b642009cbae37ad8ff728761faf7a44ffc54/zope.preference-4.1.0-py2.py3-none-any.whl
  Downloading from URL https://files.pythonhosted.org/packages/38/1a/5541055a7004dab6e8cb1486b642009cbae37ad8ff728761faf7a44ffc54/zope.preference-4.1.0-py2.py3-none-any.whl#sha256=c833683d90a213e445d2d1263c9ba9935a53088b464dd1dac4ce93cc4d48a0ed (from https://pypi.org/simple/zope-preference/)
  Saved /tmp/tmp29aasjju/zope.preference-4.1.0-py2.py3-none-any.whl
  Added zope.preference==4.1.0 from https://files.pythonhosted.org/packages/38/1a/5541055a7004dab6e8cb1486b642009cbae37ad8ff728761faf7a44ffc54/zope.preference-4.1.0-py2.py3-none-any.whl#sha256=c833683d90a213e445d2d1263c9ba9935a53088b464dd1dac4ce93cc4d48a0ed to build tracker '/tmp/pip-req-tracker-8sdk3duw'
  Removed zope.preference==4.1.0 from https://files.pythonhosted.org/packages/38/1a/5541055a7004dab6e8cb1486b642009cbae37ad8ff728761faf7a44ffc54/zope.preference-4.1.0-py2.py3-none-any.whl#sha256=c833683d90a213e445d2d1263c9ba9935a53088b464dd1dac4ce93cc4d48a0ed from build tracker '/tmp/pip-req-tracker-8sdk3duw'
Skipping zope.preference, due to already being wheel.
Cleaning up...
  Removing source in /tmp/pip-wheel-wz1b9q0i/zope.preference
Removed build tracker '/tmp/pip-req-tracker-8sdk3duw'