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how to use 80390 MDU?

In Keil IDE , i open arithmatic accelerator.
But when I compile it. Will display this message. I seem that need some lib. How can
I do?

*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: ?C?ULSHRDA
MODULE: .\obj\drvsmc.obj (DRVSMC)
ADDRESS: 6273H

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