This patch was developed in-house, and submitted upstream:

--- Python-3.4.4/Lib/posixpath.py.orig 2015-12-20 22:00:59.000000000 -0800

+++ Python-3.4.4/Lib/posixpath.py 2016-02-19 13:05:44.295727065 -0800

@@ -31,7 +31,7 @@

extsep = '.'

sep = '/'

pathsep = ':'

-defpath = ':/bin:/usr/bin'

+defpath = '/bin:/usr/bin'

altsep = None

devnull = '/dev/null'