I am using boost build v1, VC 8. While building my project I get following errors, ***************************************************************** DQEasy.obj : error LNK2019: unresolved external symbol "public: bool __thiscall DQP::putString(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,char const *)" (?putString@DQP@@QAE_NABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PBD@Z) referenced in function "public: class DQP * __thiscall DQEasy::getBaseRequest(void)" (?getBaseRequest@DQEasy@@QAEPAVDQP@@XZ) DQEasy.obj : error LNK2019: unresolved external symbol "public: __thiscall DQP::DQP(void)" (??0DQP@@QAE@XZ) referenced in function "public: class DQP * __thiscall DQEasy::getBaseRequest(void)" (?getBaseRequest@DQEasy@@QAEPAVDQP@@XZ) ******************************************************************** There are 63 unresolved symbols altogether. Any Ideas on how can I fix it? I have tried entering bjam "-sBUILD=<runtime-link>static" instead of bjam, still no help. I am copying my jamfile for reference. Thank you. ********************************************************************* # This is the top of our own project tree project-root ; # Include definitions needed for Python modules import python ; extension DQEasy # Declare a Python extension called DQEasy : DQEasy.cpp # source # requirements and dependencies for Boost.Python extensions <template>@boost/libs/python/build/extension : <include>. ; ***********************************************************************