FEMACS
if (Flag(FEMACS) || Flag(FGMACS))
FEMACS, FGMACS,
|| Flag(FEMACS) || Flag(FGMACS)
change_flag(FEMACS, OF_SPECIAL, 1);
|| f == FEMACS || f == FGMACS
Flag(FEMACS) = Flag(FGMACS) = 0;