[opensuse-buildservice] Leap: provider krb5 is conflicted by installed krb5-mini

Since end of last week one pkg in external buildservice is in state unresolvable for Leap 42.1 and 42.2: unresolvable: conflict for provider of krb5 needed by samba-libs (provider krb5 is conflicted by installed krb5-mini) samba-libs links against krb5. pkgA links against samba-libs, this one builds fine. pkgB has pkgA in BuildRequires and it is now in state unresolvable. Its unclear why this happens now, samba links to krb5 since forever, and pkgA links to samba-libs also since a very long time. There is nothing obvious in prjconf and its history. Any idea what the reason could be? Olaf