DIF_VERSION
dof->dofh_ident[DOF_ID_DIFVERS] = DIF_VERSION;
conf->dtc_difversion = DIF_VERSION;
if (dtp->dt_conf.dtc_difversion < DIF_VERSION)
DIF_VERSION, /* dtc_difversion */
dof->dofh_ident[DOF_ID_DIFVERS] = DIF_VERSION;
conf.dtc_difversion = DIF_VERSION;