--- setuptools-38.4.0/tox.ini	2018-01-05 13:17:02.000000000 +0000
+++ setuptools-38.4.0/tox.ini	2018-01-11 01:50:05.810000000 +0000
@@ -6,6 +6,6 @@
 
 [testenv]
 deps=-rtests/requirements.txt
-passenv=APPDATA USERPROFILE HOMEDRIVE HOMEPATH windir APPVEYOR
+passenv=APPDATA USERPROFILE HOMEDRIVE HOMEPATH windir APPVEYOR PYTHONPATH
 commands=py.test {posargs}
 usedevelop=True