Use C11 compiler:
In file included from /usr/local/include/xfce4/libxfce4util/libxfce4util.h:33,
from /usr/local/include/xfce4/libxfce4ui-2/libxfce4ui/libxfce4ui.h:23,
from appfinder-gdbus.c:23:
/usr/local/include/xfce4/libxfce4util/xfce-kiosk.h:37: error: redefinition of typedef 'XfceKiosk'
/usr/local/include/xfce4/libxfce4util/xfce-kiosk.h:35: error: previous declaration of 'XfceKiosk' was here
Approved by: mentors (implicit approval)
31ff4d3b2f