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IQmath undefined symbol



I am using the IQmathLib.h V1.5 to provide performance (speed and high accuracy) in polynomial equation solves. However I need convert the final number (IQX) to float, but the function _IQXtoF() is presenting the bellow error:

undefined                        first referenced
 symbol                              in file
---------                              ----------------
__IQ17toF(long)                  C:\Documents and Settings\xxxxxx\Debug\xxxxx.obj
>>   error: symbol referencing errors - './Debug/xxxxxx.out' not built

>> Compilation failure

I verify the 2808_IQSampleC.pjt and my software has the same configuration in the "IQmathLib.h". The curious is that in these example (2808_IQSampleC.pjt ), the function _IQXtoF() works correctly.

Please, can somebody help me?

Regards,

Andrea