Bug#849216: Packages which FTBFS with AssertionError about len(context)

[ju]

Niko Tyni:
> 
> Seems to be https://github.com/sphinx-doc/sphinx/issues/3212
> which should be fixed in sphinx_1.4.9-2, migrated to testing today or so.
> 
With that version of sphinx, dhcpcanon does not fail to build.

Thanks,
ju.