There's a bug in way_writer.cc line 95 affecting the makeobj tool:
sprintf(buf, "%simage[new2][0]", image_type[backtofront]);
This is part of a check if the dat file lists switch images and this line is in the "no seasons" branch so the check always fails. It should use "%simage[new2]".
Should be fixed in r11004, thanks for the report.