Hi Chris, I can't reproduce this FTBFS at all using an up-to-date pbuilder sid chroot. According to your build log:
> Get:10 http://httpredir.debian.org/debian sid/main amd64 cdbs all 0.4.132 > [79.1 kB] That might be the culprit. It looks like cdbs has gone through a lot of changes in sid in the last month, and using a newer version of cdbs should make this FTBFS go away. Can you please try a rebuild with cdbs/0.4.137 installed? Regards, Vincent