Hi,
with the comments and patch from Jose Marcio Martins da Cruz I've released a new version of surblhost, available from:
http://surblhost.sourceforge.net
This version includes the configure-patch from Jose, as well as the ability to load whitelists and two-level TLDs.
The old lists are still there (and hardcoded), but now you can at least override them. I will phase out the hardcoded lists in the future, so they will reside in /usr/local/share or something like that.
Cheers, and have a great weekend!
-- Christian Stigen Larsen, http://csl.sublevel3.org