Hello everyone, I'm trying to use boost lib asio in a project on eclipse (running on ubuntu 8.10). So far i'm getting this errors when trying to build the project. '/home/matheus/boost_1_39_0' is where i've unpacked boost lib downloaded from sourceforge.net . I've also set this directory to the include path in eclipse. So, any help? Description Resource Path Location Type /home/matheus/boost_1_39_0/boost/asio/detail/posix_signal_blocker.hpp undefined reference to `pthread_sigmask' Proxy_Server line 48 C/C++ Problem /home/matheus/boost_1_39_0/boost/asio/detail/posix_signal_blocker.hpp undefined reference to `pthread_sigmask' Proxy_Server line 55 C/C++ Problem /home/matheus/boost_1_39_0/boost/asio/detail/posix_thread.hpp undefined reference to `pthread_detach' Proxy_Server line 69 C/C++ Problem /home/matheus/boost_1_39_0/boost/asio/detail/posix_thread.hpp undefined reference to `pthread_join' Proxy_Server line 77 C/C++ Problem /home/matheus/boost_1_39_0/boost/asio/detail/posix_tss_ptr.hpp undefined reference to `pthread_getspecific' Proxy_Server line 67 C/C++ Problem /home/matheus/boost_1_39_0/boost/asio/detail/posix_tss_ptr.hpp undefined reference to `pthread_key_create' Proxy_Server line 47 C/C++ Problem /home/matheus/boost_1_39_0/boost/asio/detail/posix_tss_ptr.hpp undefined reference to `pthread_key_delete' Proxy_Server line 61 C/C++ Problem /home/matheus/boost_1_39_0/boost/asio/detail/posix_tss_ptr.hpp undefined reference to `pthread_setspecific' Proxy_Server line 73 C/C++ Problem /home/matheus/boost_1_39_0/boost/asio/error.hpp undefined reference to `boost::system::get_system_category()' Proxy_Server line 218 C/C++ Problem /home/matheus/boost_1_39_0/boost/system/error_code.hpp undefined reference to `boost::system::get_generic_category()' Proxy_Server line 206 C/C++ Problem /home/matheus/boost_1_39_0/boost/system/error_code.hpp undefined reference to `boost::system::get_generic_category()' Proxy_Server line 211 C/C++ Problem /home/matheus/boost_1_39_0/boost/system/error_code.hpp undefined reference to `boost::system::get_generic_category()' Proxy_Server line 212 C/C++ Problem /home/matheus/boost_1_39_0/boost/system/error_code.hpp undefined reference to `boost::system::get_system_category()' Proxy_Server line 205 C/C++ Problem /home/matheus/boost_1_39_0/boost/system/error_code.hpp undefined reference to `boost::system::get_system_category()' Proxy_Server line 213 C/C++ Problem /home/matheus/boost_1_39_0/boost/system/error_code.hpp undefined reference to `boost::system::get_system_category()' Proxy_Server line 312 C/C++ Problem Thanx and best regards, -- Matheus Araújo Aguiar Computer Scientist matheus.pit@gmail.com