Hello all from a new user here

I'm using the latest SVN version of Lazarus with FPC 2.0.2 and so far everything seems to work fine
(except some well known common problems).
Just curious: what does this warning mean I see on my (gnome-) terminal when I start Lazarus:
Gtk-WARNING **: Ladbares Modul in Module-Pfad: "libsmooth.so" kann nicht gefunden werden For non german readers: loadable module in module-path: "libsmooth.so" can't be found.
It's definitely in /usr/lib (sym-link):
lrwxrwxrwx 1 root root 43 25. Mär 18:10 /usr/lib/libsmooth.so -> /usr/lib/gtk-2.0/2.4.0/engines/libsmooth.so
I googled for it but couldn't find even a single report. So am I really the only one?
Or do you all just ignore it, since it's only a warning?