Hi All, I use program_options happily. One minor annoyance is that the headers somewhere seems to specify which version of the library (the exact file name) they want to link with. I've tried setting "#define BOOST_PROGRAM_OPTIONS_NO_LIB ON" that I found by googling, but it made no difference. I always get "LINK : fatal error LNK1104: cannot open file 'libboost_program_options-vc100-mt-gd-1_44.lib'". Ideally, I'd like to link with libboost_program_options-vc100-mt-gd.lib so that when I upgrade boost I don't have to change the includes in my project files. More strangely, on one of the three computers I work with, next to the library corresponding to the newest boost version, it always requests to link to **-1_41.lib files as well, complete cleaning and rebuilding from scratch does not solve this. I have observed this with both MSVC2008 and MSVC2010. How can I configure program_options such that I can do the linking myself? Best and thanks! Dee