Created attachment 5657 update intltool Switches from AC_PROG_INTLTOOL to IT_PROG_INTLTOOL. See https://bugzilla.xfce.org/show_bug.cgi?id=8930 for details.
Thanks for the patch! Applied here: http://git.xfce.org/xfce/exo/commit/?id=e2a4d4e6ab09de57799eeb3eb137453a320fb3c3