Petsc rebuilt successfully [1] a couple of hours ago on poulenc.d.o. [2]. My previous tests were done on partch.d.o. [3]. Partch has 2GB of RAM vs Poulenc's 5GB, I don't know if this is significant.
[1] https://buildd.debian.org/status/fetch.php?pkg=petsc&arch=powerpc&ver=3.6.2.dfsg1-3%2Bb3&stamp=1455016089 [2] https://db.debian.org/machines.cgi?host=poulenc [3] https://db.debian.org/machines.cgi?host=partch
