Hello,
I have now libumberlog packaged for openSUSE/SLES (tested only on openSUSE 12.1). It is available at https://build.opensuse.org/package/show?package=libumberlog&project=home... For SLES and 11.4 one also needs to install json-c from my repository, as these are not available in those distributions. It could probably also used as a basis for a Fedora package. There is also a FreeBSD port in the works, most likely published next week. Or if interested, I can send my current version by e-mail.
Bye,