[SyncEvolution] SyncEvolution and Ubuntu Online Accounts

Hi all! I'm working on adding Ubuntu Online Accounts (UOA) support to SyncEvolution, and I've several unrelated questions about it. Code wise, is it fine if I modify the existing gSSO code, and add some #ifdef so that it can work with UOA as well? Or is it preferrable if I duplicate the whole backend, so that they can be used in parallel? (obviously, signond a gsignond cannot be run at the same time in the same user session; but it might be that on the same machine they both run for different users, using different DEs) I managed to build SyncEvolution with my changes; but when I run it I get this error: ================ $ SYNCEVOLUTION_DEBUG=1 syncevolution --daemon=no loglevel=4 \ --print-databases backend=caldav \ username=gsso:24,google-caldav \ syncURL=https://apidata.googleusercontent.com/caldav/v2 caldav: CalDAV: not enabled during compilation or not usable in the current environment ================ And the same error if I try with carddav. I don't see any mention of them in the configure log; how can I check if they are actually built or if it's a runtime error? Ciao, Alberto