/usr/lib/python2.7/dist-packages/lxml/includes/config.pxd is in python-lxml 3.5.0-1ubuntu0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | cdef extern from "etree_defs.h":
cdef bint ENABLE_THREADING
cdef bint ENABLE_SCHEMATRON
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