The sparc buildd vore.debian.org is in a Catch-22 kind of state, where package builds die because of a problem with sbcl 0.8.2.12-3 failing to complete its configuration, including newer versions of sbcl and common-lisp-controller that have been uploaded to fix the problem! Someone with root permission needs to remove the old version of sbcl completely to unblock all package builds.
It seems simple to fix, yet it's been like this for days with no explanation. -- Neil Roeth