I've read through all the other previous messages dealing with problems with Regexp and VC++, but I wasn't able to find a good answer for my problem. I compiled Regexp++ without any problems. I added the correct directory path for the libraries, so that happens automatically (in my case it links with boost_regex_vc6-stlport_mssd.lib (multithreaded, static run, static link, debug). However, as soon as I try to use any regexp function or class from my code, it comes back with a link error. For example, trying to use the RegExp class, I get: error LNK2001: unresolved external symbol "public: __thiscall boost::RegEx::RegEx(class _STL::basic_string<char,struct std::char_traits <char>,class _STL::allocator<char> > const &,bool)" (?? 0RegEx@boost@@QAE@ABV?$basic_string@DU?$char_trai ts@D@std@@V?$allocator@D@_STL@@@_STL@@_N@Z) bin/XXXXXX.exe : fatal error LNK1120: 1 unresolved externals Can anybody guess as to what might be wrong? I'm using VC++ 6.0 with the latest upgrades and STLPort 4.5.3. Thanks. --Noel llopis@comcast.net