The best place to ask questions about Libosmscout is on its mailinglist.
You can find instructions to subscribe to the mailinglist here.
Note that you must first subscribe to the list. If you send mails to the list befor beeing subscribed you either have to wait for the maintainer to pass them through (which may take a while) or they will never appear on the list at all.
You can find a searchable archive of the mailinglist here.
If everything else fails you can contact Tim Teulings for more information.