DocBook: Warning: The Sphinx 'sphinx_rtd_theme' HTML theme was not found. Make sure you have the theme installed to produce pretty HTML output. Falling back to the default theme.

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   194dc870a5890e855ecffb30f3b80ba7c88f96d6
commit: 22cba31bae9dc357622f09d22b82ca5a112b4fde Documentation/sphinx: add basic working Sphinx configuration and build
date:   8 weeks ago
reproduce: make htmldocs

All warnings (new ones prefixed by >>):

>> Warning: The Sphinx 'sphinx_rtd_theme' HTML theme was not found. Make sure you have the theme installed to produce pretty HTML output. Falling back to the default theme.

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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