I am getting errors including the new version of token_functions.hpp without first including tokenizer.hpp. When I do, I get the following error (my compiler is VC++ 6.0): rror C2065: 'is_pointer' : undeclared identifier Including tokenizer.hpp first gets rid of the problem. I think you just need to add the line #include <boost/type_traits/is_pointer.hpp> to token_functions.hpp. Joe Gottman