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printf_s

I have this error when compile a USB library for target LPC2478 using uVsion3 V3.62c:
undefined symbol _printf_d
undefined symbol _printf_s
undefined symbol _printf_flags
undefined symbol _printf_u
undefined symbol _printf_x
undefined symbol _printf_widthprec

Because I have no source file I can't modify the module that use this function.
Is there a way to introduce this function in my project?.....in the <stdio.h> of keil?....
Thanks

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