https://wiki.debian.org/Derivatives/Integration#Patches
https://dex.alioth.debian.org/census/patches/

* Where Debian derivatives source packages come from?
** I don't find explained in the wiki where the information (source packages?) about Debian derivatives comes from.
** And, also, if you have an automated way of getting these Debian derivatives source packages.
** Should this process be encouraged to be done by the derivative itself? Maybe only for mature distributions like Ubuntu ?