Hi Ximin, Am 21.04.2017 um 09:24 schrieb Ximin Luo: > I'm not sure why it's failing, I thought maybe you need to backport sphinx but it's already backported. The existence of a backport doesn't mean that it is automatically being used when building a backport of another package. Do the build dependencies reflect the fact that the newer sphinx package is needed? Regards, Micha