report incompatible thing

[Xin Qi]

I compile mysql++ both with boost_1_36, but the code can not go through gcc
4.2.4 because there are conflicts
between
 ./boost/concept_check.hpp:  BOOST_concept(Comparable,(TT))
./boost/concept_check.hpp:    BOOST_CONCEPT_USAGE(Comparable) {
./boost/concept_check.hpp:    , EqualityComparable<TT>
./boost/concept_check.hpp:    , Comparable<TT>
and
/mysqlpp/datetime.h:   class MYSQLPP_EXPORT DateTime : public
Comparable<DateTime>

but when I change boost 1.34, the code could be compiled successfully.