Cannot install xfce, fails at compiling installer

[Dan Gordon]

Im running suse 9.3 pro with gtk2 (2.6.4-6) and when the installer gets to 
Compiling installer-gui it fails with this.
Compiling installer-gui...  failed, see /root/.xfce4.installer-log for 
details.
The log is filled with a whole lot of this.

/opt/gnome/include/gtk-2.0/gtk/gtktreeview.h:170: error: syntax error 
before "G_GNUC_SENTINEL"
/opt/gnome/include/gtk-2.0/gtk/gtktreeview.h:170: warning: data 
definition has no type or storage class
In file included from /opt/gnome/include/gtk-2.0/gtk/gtk.h:82,
                 from i2t/i2t-page.h:27,
                 from i2t/i2t-page.c:24:
/opt/gnome/include/gtk-2.0/gtk/gtkfilechooserdialog.h:58: error: syntax 
error before "G_GNUC_SENTINEL"
/opt/gnome/include/gtk-2.0/gtk/gtkfilechooserdialog.h:58: warning: data 
definition has no type or storage class
/opt/gnome/include/gtk-2.0/gtk/gtkfilechooserdialog.h:64: error: syntax 
error before "G_GNUC_SENTINEL"
/opt/gnome/include/gtk-2.0/gtk/gtkfilechooserdialog.h:64: warning: data 
definition has no type or storage class
In file included from /opt/gnome/include/gtk-2.0/gtk/gtk.h:158,
                 from i2t/i2t-page.h:27,
                 from i2t/i2t-page.c:24:
/opt/gnome/include/gtk-2.0/gtk/gtktextbuffer.h:189: error: syntax error 
before "G_GNUC_SENTINEL"
/opt/gnome/include/gtk-2.0/gtk/gtktextbuffer.h:189: warning: data 
definition has no type or storage class
/opt/gnome/include/gtk-2.0/gtk/gtktextbuffer.h:196: error: syntax error 
before "G_GNUC_SENTINEL"
/opt/gnome/include/gtk-2.0/gtk/gtktextbuffer.h:196: warning: data 
definition has no type or storage class
/opt/gnome/include/gtk-2.0/gtk/gtktextbuffer.h:295: error: syntax error 
before "G_GNUC_SENTINEL"
/opt/gnome/include/gtk-2.0/gtk/gtktextbuffer.h:295: warning: data 
definition has no type or storage class

Any help would be appreciated.

Regards,
Dan Gordon
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