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Since commit v3.8.0-rc2~28^2~2 (Utilities/Sphinx: Port cmake extension to Sphinx 1.4, 2017-02-09) we use the `sphinx.version_info` tuple. However, it was added in Sphinx v1.2 so the check breaks compatibility with older versions. Revise our check to assume Sphinx pre-1.2 if the version tuple does not exist.
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