Hi Gregor
Indeed. Well, that is a bit misleading from pbuilder. So I guess it must have been a typo.
Hi Norbert
I cloned the full repository again yesterday night after I had fixed the Perl 5.18 dependencies in aptitude on my host system. I had to add libfile-which-perl as a Build-Depends, because one of the tests complains about it. Same for one of the libunicode-* packages, otherwise my build would complain about a missing Unicode::GCString module.
Tonight I have again access to my box and will recreate the COW image completely.