i `ve read  " All packages (except xfce4-dev-tools) depend on both gtk+ >= 2.10 and glib >= 2.12." on xfce`s web page.
but that is not true anymore. fo example,

in recent git version xfdesktop,

  CC     xfdesktop-xfdesktop-volume-icon.o
  CCLD   xfdesktop
xfdesktop-xfdesktop-app-menu-item.o: In function `xfdesktop_app_menu_item_changed':
/media/sdc2/xfdesktop/src/xfdesktop-app-menu-item.c:236: undefined reference to `gtk_menu_item_set_label'
xfdesktop-xfdesktop-file-icon-manager.o: In function `xfdesktop_file_icon_manager_files_ready':
/media/sdc2/xfdesktop/src/xfdesktop-file-icon-manager.c:2228: undefined reference to `gtk_widget_is_toplevel'
collect2: ld returned 1 exit status
make[3]: *** [xfdesktop] error 1
make[3]: Leaving directory `/media/sdc2/xfdesktop/src'
make[2]: *** [all] error 2
make[2]: Leaving directory `/media/sdc2/xfdesktop/src'
make[1]: *** [all-recursive] error 1
make[1]: Leaving directory `/media/sdc2/xfdesktop'
make: *** [all] error 2


gtk_menu_item_set_label , gtk_widget_is_toplevel is all
gtk 2.16 function.so naturally make error on my gtk 2,14.

and i reported already four months ago ristretto `s same error ( http://bugzilla.xfce.org/show_bug.cgi?id=6432 )
but still not fixed.

if will not support old gtk version,
it will be so sad news to me like old user.