Hi, I am trying to use Boost.Date_Time (and Boost) for the first time, and I failed to compile the following : ------------------------------------ #include <iostream> #include <iomanip> #include #include int main(int, char **) { using namespace std; using namespace boost::posix_time; using namespace boost::gregorian; std::cout << to_simple_string(second_clock::universal_time()); return 0; } ----------------------------------------- I get these comments : g++ -c -pipe -Wall -W -O2 -g -pipe -m32 -march=i386 -mtune=pentium4 -DQT_NO_DEBUG -DQT_SHARED -DQT_THREAD_SUPPORT -I/usr/lib/qt-3.3/mkspecs/default -I. -I/usr/lib/qt-3.3/include -o receiver.o receiver.cpp g++ -o receiver.exe receiver.o -L/usr/lib/qt-3.3/lib -L/usr/X11R6/lib -lchoo -lqt-mt -lXext -lX11 -lm receiver.o(.text+0xb96): In function `main': /usr/include/boost/date_time/date_formatting.hpp:43: undefined reference to `boost::gregorian::greg_month::as_short_string() const' I found some threads about this error but no solution. Can any one help? I am using Boost 1.32.0. Cheers, Patrick