<snip>
> Would you send me a copy of your libcarddav config.log?
<snip>

Sure!  This is another reason I like to use the QuickBuild system when
possible; it retains all that information for later analysis.  You can get
at a build log by expanding the package you are interested in, then
clicking on the architecture you want to see build details for.  Then
click on buildlog.

Here is a direct link for the carddav package:
https://quickbuild.pearsoncomputing.net/~trinity/+archive/trinity-builddeps/+build/713/+files/buildlog_ubuntu-lenny-i386.libcarddav_0.6.2-0debian2_FULLYBUILT.txt.gz

Tim