Hi I&#39;ve been trying to use boost program options and heres the linker error i get.&nbsp; Compling with gcc mingW 4.1 .<br><br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(convert.o):convert.cpp:(.text+0x8f): undefined reference to `std::codecvt&lt;wchar_t, char, int&gt;::codecvt(unsigned int)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(convert.o):convert.cpp:(.text+0xb7): undefined reference to `std::codecvt&lt;wchar_t, char, int&gt;::~codecvt()&#39;<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(
convert.o):convert.cpp:(.text+0x1b1): undefined reference to `std::codecvt&lt;wchar_t, char, int&gt;::id&#39;<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(convert.o):convert.cpp:(.text+0x2e5): undefined reference to `std::codecvt&lt;wchar_t, char, int&gt;::id&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(convert.o):convert.cpp:(.text$_ZN5boost6detail7convertIwcNS_3_bi6bind_tINSt12codecvt_base6resultENS_4_mfi4cmf7IS5_St23__codecvt_abstract_baseIwciERiPKcSC_RSC_PwSE_RSE_EENS2_5list8INS2_5valueIPKSt7codecvtIwciEEEPFNS_3argILi1EEEvEPFNSO_ILi2EEEvEPFNSO_ILi3EEEvEPFNSO_ILi4EEEvEPFNSO_ILi5EEEvEPFNSO_ILi6EEEvEPFNSO_ILi7EEEvEEEEEEESbIT_St11char_traitsIS1C_ESaIS1C_EERKSbIT0_S1D_IS1H_ESaIS1H_EET1_[std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; boost::detail::convert&lt;wchar_t, char, boost::_bi::bind_t&lt;std::codecvt_base::result, boost::_mfi::cmf7&lt;std::codecvt_base::result, std::__codecvt_abstract_base&lt;wchar_t, char, int&gt;, int&amp;, char const*, char const*, char const*&amp;, wchar_t*, wchar_t*, wchar_t*&amp;&gt;, boost::_bi::list8&lt;boost::_bi::value&lt;std::codecvt&lt;wchar_t, char, int&gt; const*&gt;, boost::arg&lt;1&gt; (*)(), boost::arg&lt;2&gt; (*)(), boost::arg&lt;3&gt; (*)(), boost::arg&lt;4&gt; (*)(), boost::arg&lt;5&gt; (*)(), boost::arg&lt;6&gt; (*)(), boost::arg&lt;7&gt; (*)()&gt; &gt; &gt;(std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; const&amp;, boost::_bi::bind_t&lt;std::codecvt_base::result, boost::_mfi::cmf7&lt;std::codecvt_base::result, std::__codecvt_abstract_base&lt;wchar_t, char, int&gt;, int&amp;, char const*, char const*, char const*&amp;, wchar_t*, wchar_t*, wchar_t*&amp;&gt;, boost::_bi::list8&lt;boost::_bi::value&lt;std::codecvt&lt;wchar_t, char, int&gt; const*&gt;, boost::arg&lt;1&gt; (*)(), boost::arg&lt;2&gt; (*)(), boost::arg&lt;3&gt; (*)(), boost::arg&lt;4&gt; (*)(), boost::arg&lt;5&gt; (*)(), boost::arg&lt;6&gt; (*)(), boost::arg&lt;7&gt; (*)()&gt; &gt;)]+0x82): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_S_construct(unsigned int, wchar_t, std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(convert.o):convert.cpp:(.text$_ZN5boost6detail7convertIwcNS_3_bi6bind_tINSt12codecvt_base6resultENS_4_mfi4cmf7IS5_St23__codecvt_abstract_baseIwciERiPKcSC_RSC_PwSE_RSE_EENS2_5list8INS2_5valueIPKSt7codecvtIwciEEEPFNS_3argILi1EEEvEPFNSO_ILi2EEEvEPFNSO_ILi3EEEvEPFNSO_ILi4EEEvEPFNSO_ILi5EEEvEPFNSO_ILi6EEEvEPFNSO_ILi7EEEvEEEEEEESbIT_St11char_traitsIS1C_ESaIS1C_EERKSbIT0_S1D_IS1H_ESaIS1H_EET1_[std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; boost::detail::convert&lt;wchar_t, char, boost::_bi::bind_t&lt;std::codecvt_base::result, boost::_mfi::cmf7&lt;std::codecvt_base::result, std::__codecvt_abstract_base&lt;wchar_t, char, int&gt;, int&amp;, char const*, char const*, char const*&amp;, wchar_t*, wchar_t*, wchar_t*&amp;&gt;, boost::_bi::list8&lt;boost::_bi::value&lt;std::codecvt&lt;wchar_t, char, int&gt; const*&gt;, boost::arg&lt;1&gt; (*)(), boost::arg&lt;2&gt; (*)(), boost::arg&lt;3&gt; (*)(), boost::arg&lt;4&gt; (*)(), boost::arg&lt;5&gt; (*)(), boost::arg&lt;6&gt; (*)(), boost::arg&lt;7&gt; (*)()&gt; &gt; &gt;(std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; const&amp;, boost::_bi::bind_t&lt;std::codecvt_base::result, boost::_mfi::cmf7&lt;std::codecvt_base::result, std::__codecvt_abstract_base&lt;wchar_t, char, int&gt;, int&amp;, char const*, char const*, char const*&amp;, wchar_t*, wchar_t*, wchar_t*&amp;&gt;, boost::_bi::list8&lt;boost::_bi::value&lt;std::codecvt&lt;wchar_t, char, int&gt; const*&gt;, boost::arg&lt;1&gt; (*)(), boost::arg&lt;2&gt; (*)(), boost::arg&lt;3&gt; (*)(), boost::arg&lt;4&gt; (*)(), boost::arg&lt;5&gt; (*)(), boost::arg&lt;6&gt; (*)(), boost::arg&lt;7&gt; (*)()&gt; &gt;)]+0x152): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::replace(unsigned int, unsigned int, wchar_t const*, unsigned int)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(convert.o):convert.cpp:(.text$_ZN5boost6detail7convertIwcNS_3_bi6bind_tINSt12codecvt_base6resultENS_4_mfi4cmf7IS5_St23__codecvt_abstract_baseIwciERiPKcSC_RSC_PwSE_RSE_EENS2_5list8INS2_5valueIPKSt7codecvtIwciEEEPFNS_3argILi1EEEvEPFNSO_ILi2EEEvEPFNSO_ILi3EEEvEPFNSO_ILi4EEEvEPFNSO_ILi5EEEvEPFNSO_ILi6EEEvEPFNSO_ILi7EEEvEEEEEEESbIT_St11char_traitsIS1C_ESaIS1C_EERKSbIT0_S1D_IS1H_ESaIS1H_EET1_[std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; boost::detail::convert&lt;wchar_t, char, boost::_bi::bind_t&lt;std::codecvt_base::result, boost::_mfi::cmf7&lt;std::codecvt_base::result, std::__codecvt_abstract_base&lt;wchar_t, char, int&gt;, int&amp;, char const*, char const*, char const*&amp;, wchar_t*, wchar_t*, wchar_t*&amp;&gt;, boost::_bi::list8&lt;boost::_bi::value&lt;std::codecvt&lt;wchar_t, char, int&gt; const*&gt;, boost::arg&lt;1&gt; (*)(), boost::arg&lt;2&gt; (*)(), boost::arg&lt;3&gt; (*)(), boost::arg&lt;4&gt; (*)(), boost::arg&lt;5&gt; (*)(), boost::arg&lt;6&gt; (*)(), boost::arg&lt;7&gt; (*)()&gt; &gt; &gt;(std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; const&amp;, boost::_bi::bind_t&lt;std::codecvt_base::result, boost::_mfi::cmf7&lt;std::codecvt_base::result, std::__codecvt_abstract_base&lt;wchar_t, char, int&gt;, int&amp;, char const*, char const*, char const*&amp;, wchar_t*, wchar_t*, wchar_t*&amp;&gt;, boost::_bi::list8&lt;boost::_bi::value&lt;std::codecvt&lt;wchar_t, char, int&gt; const*&gt;, boost::arg&lt;1&gt; (*)(), boost::arg&lt;2&gt; (*)(), boost::arg&lt;3&gt; (*)(), boost::arg&lt;4&gt; (*)(), boost::arg&lt;5&gt; (*)(), boost::arg&lt;6&gt; (*)(), boost::arg&lt;7&gt; (*)()&gt; &gt;)]+0x424): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x19f): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x28b): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2d2): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x367): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x40b): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x44c): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x526): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x57e): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x5ed): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x10bb): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x128f): more undefined references to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39; follow
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x215f): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x21c5): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2299): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;, unsigned int, unsigned int)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x22cb): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x234a): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2367): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_M_leak_hard()&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x23b3): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_M_leak_hard()&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x23cf): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x23eb): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_M_leak_hard()&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2406): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_M_leak_hard()&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x24da): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2519): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2a4a): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2a8f): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_M_leak_hard()&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2b07): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_M_leak_hard()&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2b2b): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::compare(wchar_t const*) const&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2be6): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::compare(wchar_t const*) const&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2c02): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::compare(wchar_t const*) const&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2c1e): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::compare(wchar_t const*) const&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2c41): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::compare(wchar_t const*) const&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2c60): more undefined references to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::compare(wchar_t const*) const&#39; follow
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2ccf): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2db2): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::compare(wchar_t const*) const&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2dce): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::compare(wchar_t const*) const&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text+0x2f50): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNK5boost3any6holderISbIwSt11char_traitsIwESaIwEEE5cloneEv[boost::any::holder&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt;::clone() const]+0x67): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZN5boost3any6holderISbIwSt11char_traitsIwESaIwEEED0Ev[boost::any::holder&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt;::~holder()]+0x93): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZN5boost3any6holderISbIwSt11char_traitsIwESaIwEEED1Ev[boost::any::holder&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt;::~holder()]+0x8b): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x65): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x85): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0xc2): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::assign(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0xec): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::assign(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x1d4): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x21a): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x27d): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::basic_string(std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x302): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x35a): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x48a): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x4fc): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x589): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZNSt6vectorISbIwSt11char_traitsIwESaIwEESaIS3_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS3_S5_EERKS3_[std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;*, std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; &gt;, std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp;)]+0x627): more undefined references to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_Rep::_M_destroy(std::allocator&lt;wchar_t&gt; const&amp;)&#39; follow
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(value_semantic.o):value_semantic.cpp:(.text$_ZN5boost15program_options10validators17get_single_stringIwEERKSbIT_St11char_traitsIS3_ESaIS3_EERKSt6vectorIS7_SaIS7_EEb[std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; const&amp; boost::program_options::validators::get_single_string&lt;wchar_t&gt;(std::vector&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;, std::allocator&lt;std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt; &gt; &gt; const&amp;, bool)]+0x19d): undefined reference to `std::basic_string&lt;wchar_t, std::char_traits&lt;wchar_t&gt;, std::allocator&lt;wchar_t&gt; &gt;::_S_construct(unsigned int, wchar_t, std::allocator&lt;wchar_t&gt; const&amp;)&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(utf8_codecvt_facet.o):utf8_codecvt_facet.cpp:(.text$_ZN5boost15program_options6detail18utf8_codecvt_facetD0Ev[boost::program_options::detail::utf8_codecvt_facet::~utf8_codecvt_facet()]+0x12): undefined reference to `std::codecvt&lt;wchar_t, char, int&gt;::~codecvt()&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(utf8_codecvt_facet.o):utf8_codecvt_facet.cpp:(.text$_ZN5boost15program_options6detail18utf8_codecvt_facetD1Ev[boost::program_options::detail::utf8_codecvt_facet::~utf8_codecvt_facet()]+0xe): undefined reference to `std::codecvt&lt;wchar_t, char, int&gt;::~codecvt()&#39;
<br>C:/Boost/lib/libboost_program_options-mgw41-1_34.a(utf8_codecvt_facet.o):utf8_codecvt_facet.cpp:(.rdata$_ZTVN5boost15program_options6detail18utf8_codecvt_facetE[vtable for boost::program_options::detail::utf8_codecvt_facet]+0x24): undefined reference to `std::codecvt&lt;wchar_t, char, int&gt;::do_length(int&amp;, char const*, char const*, unsigned int) const&#39;
<br>collect2: ld returned 1 exit status<br>make: *** [NeuralNetProject.exe] Error 1<br><br>