Hello I would like ot use g++ to compile a programme which use boost regex To use regex I put this lines in the header of test_expreg.cpp : #include <boost/cregex.hpp> #include <boost/regex.hpp> The file compiles fine with this command line : g++ -c test_expreg.cpp -o test_expreg.o But I can't link : g++ -o test_expreg test_expreg.o Produce error : : undefined reference to `boost::RegEx::RegEx(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool)' I tried : g++ -o test_expreg test_expreg.o -L/usr/bin -llibboost_regex And obtained this error : /usr/bin/ld: ne peut trouver -llibboost_regex Someone could tel me how compile correcly this programme that already compiles well en Microsoft Visual C++ but that I can't compile with g++ on Linux Fecora Core 3 Thanks, Laurent