libconfig9 for Wheezy?
libconfig  has not been updated since Squeeze, and is lagging
upstream by a major version.
Packaging the upstream release is not a problem, but an ABI change will
require a transition from libconfig8 to libconfig9.
The maintainer is aware of the problem, and this has been tracked as
wishlist bug #583528 since May 2010 .
Is there enough time left to have this updated before the Wheezy freeze