Very basic carbons support is hacked into mcabber. Messages are now intercepted and parsed. It probably makes more sense to implement XEP-0297: Stanza Forwarding in a more general way. A better way to display the carbons (so the user actually knows it is a carbon message) is in the pipeline.

#! /bin/sh

libtoolize --force --automake --copy
aclocal -I macros/
autoheader
autoconf
automake -a --copy