[Boost-users] Sexpr Parser example of utree compiles error--function and symbol cannot be resolved

Hi, I am new to the boost, I download the boost 1.49.0 and try to build the utree example – Sexpr Parser(environment: eclipse +CDT + gcc4.5.2), but It failed and I got the error info about the “sexpr_gemerator.hpp” as follows: Function ‘attr_cast’ could not be resolved Function ‘call’ could not be resolved Symbol ‘boo_policies’ could not be resolved Symbol ‘String_inserter’ could not be resolved Actually, I check the header, It already has ‘#include ’ which will finally include ‘#include ’, where karma::attr_cast is defined Does anyone know the reason? how can I make the example run successfully? thanks By the way, I can build other exmple like “mini-xml parser” in the doc library. Best, Feng