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diff --git a/third_party/python/futures/docs/Makefile b/third_party/python/futures/docs/Makefile
new file mode 100644
index 0000000000..f69d840353
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+++ b/third_party/python/futures/docs/Makefile
@@ -0,0 +1,88 @@
+# Makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+PAPER         =
+
+# Internal variables.
+PAPEROPT_a4     = -D latex_paper_size=a4
+PAPEROPT_letter = -D latex_paper_size=letter
+ALLSPHINXOPTS   = -d _build/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+
+.PHONY: help clean html dirhtml pickle json htmlhelp qthelp latex changes linkcheck doctest
+
+help:
+	@echo "Please use \`make <target>' where <target> is one of"
+	@echo "  html      to make standalone HTML files"
+	@echo "  dirhtml   to make HTML files named index.html in directories"
+	@echo "  pickle    to make pickle files"
+	@echo "  json      to make JSON files"
+	@echo "  htmlhelp  to make HTML files and a HTML help project"
+	@echo "  qthelp    to make HTML files and a qthelp project"
+	@echo "  latex     to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
+	@echo "  changes   to make an overview of all changed/added/deprecated items"
+	@echo "  linkcheck to check all external links for integrity"
+	@echo "  doctest   to run all doctests embedded in the documentation (if enabled)"
+
+clean:
+	-rm -rf _build/*
+
+html:
+	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) _build/html
+	@echo
+	@echo "Build finished. The HTML pages are in _build/html."
+
+dirhtml:
+	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) _build/dirhtml
+	@echo
+	@echo "Build finished. The HTML pages are in _build/dirhtml."
+
+pickle:
+	$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) _build/pickle
+	@echo
+	@echo "Build finished; now you can process the pickle files."
+
+json:
+	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) _build/json
+	@echo
+	@echo "Build finished; now you can process the JSON files."
+
+htmlhelp:
+	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) _build/htmlhelp
+	@echo
+	@echo "Build finished; now you can run HTML Help Workshop with the" \
+	      ".hhp project file in _build/htmlhelp."
+
+qthelp:
+	$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) _build/qthelp
+	@echo
+	@echo "Build finished; now you can run "qcollectiongenerator" with the" \
+	      ".qhcp project file in _build/qthelp, like this:"
+	@echo "# qcollectiongenerator _build/qthelp/futures.qhcp"
+	@echo "To view the help file:"
+	@echo "# assistant -collectionFile _build/qthelp/futures.qhc"
+
+latex:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) _build/latex
+	@echo
+	@echo "Build finished; the LaTeX files are in _build/latex."
+	@echo "Run \`make all-pdf' or \`make all-ps' in that directory to" \
+	      "run these through (pdf)latex."
+
+changes:
+	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) _build/changes
+	@echo
+	@echo "The overview file is in _build/changes."
+
+linkcheck:
+	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) _build/linkcheck
+	@echo
+	@echo "Link check complete; look for any errors in the above output " \
+	      "or in _build/linkcheck/output.txt."
+
+doctest:
+	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) _build/doctest
+	@echo "Testing of doctests in the sources finished, look at the " \
+	      "results in _build/doctest/output.txt."