Implementation of a compatibility layer for sphinx and docutils related modules.
Downward compatibility is unfortunately no strength of sphinx-doc [ref] and patch levels are not really exists or if so they are not shipped within LTS distributions. Therefor a minimal compatibility layer is needed. Even if we do our best here, there are also a lot of incompatibilities in between sphinx and docutils whose fixing is out of the scope of this linuxdoc project [ref].
To get best results (and less warnings) its inevitable to use latest sphinx-doc version.