/usr/lib/python3/dist-packages/lxml/includes/ is in python3-lxml 3.3.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/lxml/includes/__init__.py
/usr/lib/python3/dist-packages/lxml/includes/c14n.pxd
/usr/lib/python3/dist-packages/lxml/includes/config.pxd
/usr/lib/python3/dist-packages/lxml/includes/dtdvalid.pxd
/usr/lib/python3/dist-packages/lxml/includes/etree_defs.h
/usr/lib/python3/dist-packages/lxml/includes/etreepublic.pxd
/usr/lib/python3/dist-packages/lxml/includes/htmlparser.pxd
/usr/lib/python3/dist-packages/lxml/includes/lxml-version.h
/usr/lib/python3/dist-packages/lxml/includes/relaxng.pxd
/usr/lib/python3/dist-packages/lxml/includes/schematron.pxd
/usr/lib/python3/dist-packages/lxml/includes/tree.pxd
/usr/lib/python3/dist-packages/lxml/includes/uri.pxd
/usr/lib/python3/dist-packages/lxml/includes/xinclude.pxd
/usr/lib/python3/dist-packages/lxml/includes/xmlerror.pxd
/usr/lib/python3/dist-packages/lxml/includes/xmlparser.pxd
/usr/lib/python3/dist-packages/lxml/includes/xmlschema.pxd
/usr/lib/python3/dist-packages/lxml/includes/xpath.pxd
/usr/lib/python3/dist-packages/lxml/includes/xslt.pxd