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[Issac Trotts]

First, let me thank you for making available this wonderful library.
The bug that I'm reporting is actually a bug in gcc 2.95.2, which 
unfortunately #defines log2 in math.h instead of using inline functions.  
This conflicts with your perfectly reasonable attempt to overload log2 
in utils.h.  So, in order to get GiNaC to compile, I had to replace

unsigned log2(unsigned n);

with 

#ifdef log2
#undef log2
#endif
unsigned log2(unsigned n);

-Issac