d:\warnet\log4cplus-1.0.2\include\log4cplus\helpers\pointer.h(41) : warning C4275: non dll-interface class 'std::runtime_error' used as base for dll-interface class 'log4cplus::helpers::NullPointerException'
c:\program files\microsoft visual studio\vc98\include\stdexcept(76) : see declaration of 'runtime_error'


是不是因为没找到std的某个东西？怎么解决？