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I am trying to build a project using Boost's Asio and I am having some trouble. Initially, I tried to build the project without any additional libraries since everything is supposedly in the header files. The program I am trying to build looks like this: #include <iostream> #include <boost/asio.hpp> #include <boost/date_time/posix_time/posix_time.hpp> int main() { boost::asio::io_service io; boost::asio::deadline_timer t(io, boost::posix_time::seconds(5)); t.wait(); std::cout << "Hello, world!" << std::endl; return 0; } It can be found here on Boost's website. So, initially I just had: -I /usr/include/boost_1_40_0 This resulted in the following errors: make -k all Building target: HelloWorld Invoking: GCC C++ Linker g++ -o"HelloWorld" ./main.o ./main.o: In function `__static_initialization_and_destruction_0': /usr/include/boost_1_40_0/boost/system/error_code.hpp:205: undefined reference to `boost::system::get_system_category()' /usr/include/boost_1_40_0/boost/system/error_code.hpp:206: undefined reference to `boost::system::get_generic_category()' /usr/include/boost_1_40_0/boost/system/error_code.hpp:211: undefined reference to `boost::system::get_generic_category()' /usr/include/boost_1_40_0/boost/system/error_code.hpp:212: undefined reference to `boost::system::get_generic_category()' /usr/include/boost_1_40_0/boost/system/error_code.hpp:213: undefined reference to `boost::system::get_system_category()' ./main.o: In function `boost::asio::error::get_system_category()': /usr/include/boost_1_40_0/boost/asio/error.hpp:218: undefined reference to `boost::system::get_system_category()' ./main.o: In function `error_code': /usr/include/boost_1_40_0/boost/system/error_code.hpp:312: undefined reference t

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