Anthony Sottile added the comment:
should the minimum sphinx version be bumped and/or this reverted: https://github.com/python/cpython/blob/f7f0ed59bcc41ed20674d4b2aa443d3b79e72...
this change breaks, for example, sphinx 1.8.5 while building for ubuntu 20.04
The directive used here requires sphinx>=3.2.0
I notice some other attempts have been made to make the docs more compatible with sphinx 1.x in this release as well so there might be conflicting directions here: https://github.com/python/cpython/commit/b63a620014b67a6e63d10783149c41baaf5...
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nosy: +Anthony Sottile
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Python tracker
https://bugs.python.org/issue36675
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