Hi all, I'm new at C++ and Boost and I'm with some problems when I try to use Boost.Asio library. I was trying to build the first example from Boost.Asio's tutorial. The code is like this: ===== CODE ===== #include <iostream> #include <boost/asio.hpp> #include <boost/date_time/posix_time/posix_time.hpp> int main( int argc, char **argv ) { boost::asio::io_service io; boost::asio::deadline_timer t(io, boost::posix_time::seconds(5)); t.wait(); std::cout << "Opa !" << std::endl; return 0; } ===== CODE ===== I'm trying to compile using this command: g++ -I/usr/include/boost/ example.cpp -o example", and I'm getting this error: ==== ERROR ==== /tmp/ccv68fST.o: In function `__static_initialization_and_destruction_0(int, int)': timer.cpp:(.text+0x51): undefined reference to `boost::system::get_system_category()' timer.cpp:(.text+0x5b): undefined reference to `boost::system::get_generic_category()' timer.cpp:(.text+0x65): undefined reference to `boost::system::get_generic_category()' timer.cpp:(.text+0x6f): undefined reference to `boost::system::get_generic_category()' timer.cpp:(.text+0x79): undefined reference to `boost::system::get_system_category()' /tmp/ccv68fST.o: In function `boost::asio::error::get_system_category()': timer.cpp:(.text._ZN5boost4asio5error19get_system_categoryEv[boost::asio::error::get_system_category()]+0x7): undefined reference to `boost::system::get_system_category()' /tmp/ccv68fST.o: In function `boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false>

...

::context>::~posix_tss_ptr()': timer.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceINS1_13epoll_reactorILb0EEEEEE7contextEED2Ev[boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> ::context>::~posix_tss_ptr()]+0xf): undefined reference to `pthread_key_delete' /tmp/ccv68fST.o: In function `boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> ::context>::posix_tss_ptr()': timer.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceINS1_13epoll_reactorILb0EEEEEE7contextEEC2Ev[boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> ::context>::posix_tss_ptr()]+0x22): undefined reference to `pthread_key_create' collect2: ld returned 1 exit status ==== ERROR ====

I already installed Boost and Boost-devel packages. Does anyone know what is missing ? Thanks, -- Davi Vercillo C. Garcia B.Sc. Student - DCC-IM/UFRJ Fedora Project Contributor http://davivercillo.fedorapeople.org/ "If a million people say a foolish thing, it is still a foolish thing." - Anatole France