workaround for 0.95.
workaround for 0.76.
workaround for 0.73.
0.71 is not buildable.
workaround for 0.69.
Refine io.c modification.
workaround for 0.65.
workaround for 0.60.
workaround for 0.55.
workaround for 0.54.
workaround for 0.50.
workaround for 0.49.