TOS on Linux

I'm trying to run TOS on my home linux box, which has Fedora 4 installed, configured with Gnome 2.10 desktop and JDK1.5.0_07.

I'm disappointed to find out the default GTK look and feel is not working properly.
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[yuz@localhost tosms-1.6.3]$ ./viewer.bat
/usr/share/themes/Clearlooks/gtk-2.0/gtkrc:49: Engine "clearlooks" is unsupported, ignoring
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Anyone has fix tips? I couldn't find much info on the web.

I'm thinking about using the new swing Synth or Ocean look and feel instead. TOS must run on Linux.