Hi all! I have an application which uses STLport 5.0.0, libtorrent (which in turn uses Boost). What I have done is that I have compiled the boost libraries for msvc7.1-stlport. I only uses three, i.e. filesystem, date_time and thread. My boost version is 1.33.1 So the problem occurs when my application is linking. Then I get a lot of LNK2005 link errors. I have no problems with compiling my code and use the boost libraries it's only when I'm about to link it fails. The errors says, in general, that a lot of things already are defined in libboost_xxx_mt-sp... I guess that if I post some of my errors it will be easier for those who wants to help me :) So here we go... 1. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::operator+=(char const *)" (??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV01@PBD@Z) already defined in libboost_filesystem-vc71-mt-sp-1_33_1.lib(path_posix_windows.obj) 2. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > & __thiscall std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> >::erase(unsigned int,unsigned int)" (?erase@?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@QAEAAV12@II@Z) already defined in libboost_date_time-vc71-mt-sp-1_33_1.lib(greg_month.obj) 3. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: char __thiscall std::basic_ios<char,struct std::char_traits<char> >::widen(char)const " (?widen@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEDD@Z) already defined in libboost_thread-vc71-mt-sp-1_33_1.lib(once.obj) 4. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: class std::basic_ostream<char,struct std::char_traits<char> > * __thiscall std::basic_ios<char,struct std::char_traits<char> >::tie(void)const " (?tie@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEPAV?$basic_ostream@DU?$char_traits@D@std@@@2@XZ) already defined in libboost_thread-vc71-mt-sp-1_33_1.lib(once.obj) I would really appreciate if anyone could help me out here. Since I am new to C++ etc. I have major difficulties in intepreting the error messages. Best regards Marcus Krantz