[Tinyos-help] Help me. to use math function

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I want to use some math function in sky tmote.

But when i compile my application, there are errors like  ' undefined
reference to `log' '.

I can find log function in the file app.c for my application. It seems find
math function from "/opt/msp430/msp430/include/math.h".

How can i use normal c function (like math.h) in tinyos?

Could you give advice for this problem?
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