Hi, I am trying to dynamically link one of my *libraries* to boost program_options on windows with msvc-8.0 but linking fails due to a missing symbol. Quickly googling for this problem revealed no resolution to my problem, although it appears other people ran into this issue before. Did anyone resolve it or is everyone linking boost program_options statically? I initially ran into this issue on boost 1_34_1 but have since upgraded to 1_36 hoping it would have gotten fixed with no luck. error LNK2001: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > boost::program_options::arg" (?arg@program_options@boost@@3V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@A) Here is the link command line: link /NOLOGO /INCREMENTAL:NO /DLL /DEBUG /subsystem:console /out:"foo.dll" /IMPLIB:"foo.lib" /LIBPATH:"..\boost_1_36_0\lib.x86-nt-msvc8" @"foo.dll.rsp" And foo.dll.rsp contains besides the name of my object files also references to the following external import libraries: "boost_date_time-vc80-mt-gd-1_36.lib" "boost_filesystem-vc80-mt-gd-1_36.lib" "boost_program_options-vc80-mt-gd-1_36.lib" "boost_system-vc80-mt-gd-1_36.lib" Thanks, Sebastian