log2 not found in my math.h?

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From here:

Prototype: double log2(double anumber);
Header File: math.h (C) or cmath (C++)

Alternatively emulate it like here

#include <math.h>  
...  
// Calculates log2 of number.  
double Log2( double n )  
{  
    // log(n)/log(2) is log2.  
    return log( n ) / log( 2 );  
}

Unfortunately Microsoft does not provide it.

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