for rc8 you need wxgtk 2.4.2 and wxbase 2.4.2.
my suse 9.0 partition is broken and i can't make a rpm based on wxgtk 2.5.3 right now, so you have to compile rc8 yourself or uninstall wxgtk 2.5.3, install wxgtk&wxbase 2.4.2 and then amule rc8 rpm
cheers