Hi Flavien, I have put the porter lists of the affected architectures in CC whether there is somebody who has a hint for a better solution than removing these architectures from the supported architectures. This kind of "random failure"[1] is quite hard to debug for somebody who is not familiar for the said architectures.
Kind regards Andreas. [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=876147#20 -- http://fam-tille.de