Try disabling system site packages.

Travis has on older zope.interface which caused tests to fail: https://travis-ci.org/zopefoundation/zope.sendmail/jobs/44704754 https://travis-ci.org/zopefoundation/zope.sendmail/jobs/44704755.
zopefoundation · Dec 21, 2014 · 69690ad · 69690ad · mgedmin · Dec 22, 2014
1 parent 3fc4b71
commit 69690ad
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -5,8 +5,10 @@ python:
     - 2.7
     - 3.3
 install:
-    - pip install . --use-mirrors
+    - pip install .
 script:
     - python setup.py test -q
 notifications:
     email: false
+virtualenv:
+    system_site_packages: true