[Boost-users] Simple Linking Error

I wrote a simple "Hello, world!" program to test if boost/asio was working correctly: #include <iostream> #include <boost/date_time/posix_time/posix_time.hpp> int main() { std::cout << "Hello, world!\n"; return 0; } But, I get this: (GCC C++ 4.1.2/Linux version 2.6.22-gentoo-r8) test.cpp:(.text+0x10b): undefined reference to `boost::system::get_system_category()' test.cpp:(.text+0x115): undefined reference to `boost::system::get_posix_category()' test.cpp:(.text+0x11f): undefined reference to `boost::system::get_posix_category()' test.cpp:(.text+0x129): undefined reference to `boost::system::get_system_category()' This happens when I used '#include <boost/date_time/posix_time/posix_time.hpp>' I can't figure out what I'm missing