Since wv2 0.4.0, cmake based build system was used. But in fact, wv2 uses gobject besides glib.
Maybe you should copy FindGObject from KDE, and link libwv against gobject, too.
This also causes linker errors when using gold - see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=556686 for details.
I've attached the patch we're using in Debian to fix this issue.