Hi I am getting errors when i ininclude boost header file in my project. my progrm is running fine. I want ot use boost asio in my program. But when just write "include<boost/asio>" or any other header fie of boost in my program i am getting below errors. It just started all of a suddden before that it was working fine. I am tring it with Eclpse and MinGW.Please also guide me how t setup boost for Visual C++.net 9.0. I have tried boost_1_38_0 and boost_1_41_0 but same problem. i am getting the following errors on eclipse. Thanks in advance, -Asad Description Resource Path Location Type (Errors 5) D:/boost/boost_1_38_0/boost/system/error_code.hpp undefined reference to `boost::system::get_generic_category()' test project 206 C/C++ Problem D:/boost/boost_1_38_0/boost/system/error_code.hpp undefined reference to `boost::system::get_generic_category()' test project 211 C/C++ Problem D:/boost/boost_1_38_0/boost/system/error_code.hpp undefined reference to `boost::system::get_generic_category()' test project 212 C/C++ Problem D:/boost/boost_1_38_0/boost/system/error_code.hpp undefined reference to `boost::system::get_system_category()' test project 205 C/C++ Problem D:/boost/boost_1_38_0/boost/system/error_code.hpp undefined reference to `boost::system::get_system_category()' test project 213 C/C++ Problem (Warnings 9) Description Resource Path Location Type D:/boost/boost_1_38_0/boost/asio/detail/socket_types.hpp #warning Assuming _WIN32_WINNT=0x0501 (i.e. Windows XP target). test project 39 C/C++ Problem D:/boost/boost_1_38_0/boost/asio/detail/socket_types.hpp #warning For example, add -D_WIN32_WINNT=0x0501 to the compiler command line. test project 38 C/C++ Problem D:/boost/boost_1_38_0/boost/asio/detail/socket_types.hpp #warning Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately. test project 37 C/C++ Problem D:/boost/boost_1_38_0/boost/date_time/filetime_functions.hpp left shift count >= width of type test project 101 C/C++ Problem Invalid project path: Include path not found (C:\MinGW\include\c++\4.3.2-dw2). test project pathentry Path Entry Problem Invalid project path: Include path not found (C:\MinGW\include\c++\4.3.2-dw2\backward). test project pathentry Path Entry Problem Invalid project path: Include path not found (C:\MinGW\include\c++\4.3.2-dw2\i686-pc-mingw32). test project pathentry Path Entry Problem Invalid project path: Include path not found (C:\MinGW\lib\gcc\i686-pc-mingw32\4.3.2-dw2\include-fixed). test project pathentry Path Entry Problem Invalid project path: Include path not found (C:\MinGW\lib\gcc\i686-pc-mingw32\4.3.2-dw2\include). test project pathentry Path Entry Problem And on the console it shows like : **** Internal Builder is used for build **** g++ -ID:\boost\boost_1_38_0 -O0 -g3 -Wall -c -fmessage-length=0 -osrc\test project.o ..\src\test project.cpp In file included from D:/boost/boost_1_38_0/boost/asio/detail/win_iocp_io_service_fwd.hpp:24, from D:/boost/boost_1_38_0/boost/asio/io_service.hpp:37, from D:/boost/boost_1_38_0/boost/asio/basic_io_object.hpp:20, from D:/boost/boost_1_38_0/boost/asio/basic_socket.hpp:24, from D:/boost/boost_1_38_0/boost/asio/basic_datagram_socket.hpp:25, from D:/boost/boost_1_38_0/boost/asio.hpp:20, from ..\src\test project.cpp:12: D:/boost/boost_1_38_0/boost/asio/detail/socket_types.hpp:37:5: warning: #warning Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately. D:/boost/boost_1_38_0/boost/asio/detail/socket_types.hpp:38:5: warning: #warning For example, add -D_WIN32_WINNT=0x0501 to the compiler command line. D:/boost/boost_1_38_0/boost/asio/detail/socket_types.hpp:39:5: warning: #warning Assuming _WIN32_WINNT=0x0501 (i.e. Windows XP target). In file included from D:/boost/boost_1_38_0/boost/date_time/microsec_time_clock.hpp:23, from D:/boost/boost_1_38_0/boost/date_time/posix_time/posix_time_types.hpp:11, from D:/boost/boost_1_38_0/boost/asio/detail/select_reactor.hpp:25, from D:/boost/boost_1_38_0/boost/asio/impl/io_service.ipp:27, from D:/boost/boost_1_38_0/boost/asio/io_service.hpp:550, from D:/boost/boost_1_38_0/boost/asio/basic_io_object.hpp:20, from D:/boost/boost_1_38_0/boost/asio/basic_socket.hpp:24, from D:/boost/boost_1_38_0/boost/asio/basic_datagram_socket.hpp:25, from D:/boost/boost_1_38_0/boost/asio.hpp:20, from ..\src\test project.cpp:12: D:/boost/boost_1_38_0/boost/date_time/filetime_functions.hpp: In function `uint64_t boost::date_time::winapi::file_time_to_microseconds(const FileTimeT&)': D:/boost/boost_1_38_0/boost/date_time/filetime_functions.hpp:101: warning: left shift count >= width of type g++ -LC:\boost_1_38_0\libs -LC:\STLport-5.2.0\build\lib -otestproject.exe src\test project.o src\test project.o: In function `Z41__static_initialization_and_destruction_0ii': D:/boost/boost_1_38_0/boost/system/error_code.hpp:205: undefined reference to `boost::system::get_system_category()' D:/boost/boost_1_38_0/boost/system/error_code.hpp:206: undefined reference to `boost::system::get_generic_category()' D:/boost/boost_1_38_0/boost/system/error_code.hpp:211: undefined reference to `boost::system::get_generic_category()' D:/boost/boost_1_38_0/boost/system/error_code.hpp:212: undefined reference to `boost::system::get_generic_category()' D:/boost/boost_1_38_0/boost/system/error_code.hpp:213: undefined reference to `boost::system::get_system_category()' src\test project.o: In function `ZN5boost6detail17sp_counted_impl_pINS_4asio6detail12winsock_initILi2ELi0EE7do_initEE11get_deleterERKSt9type_info': D:/boost/boost_1_38_0/boost/detail/sp_counted_impl.hpp:(.text$_ZN5boost4asio6detail12winsock_initILi2ELi0EE7do_initD1Ev[boost::asio::detail::winsock_init<2, 0>::do_init::~do_init()]+0x7): undefined reference to `WSACleanup@0' D:/boost/boost_1_38_0/boost/detail/sp_counted_impl.hpp:(.text$_ZN5boost4asio6detail12winsock_initILi2ELi0EE7do_initC1Ev[boost::asio::detail::winsock_init<2, 0>::do_init::do_init()]+0x1f): undefined reference to `WSAStartup@8' D:/boost/boost_1_38_0/boost/detail/sp_counted_impl.hpp:(.text$_ZN5boost4asio5error19get_system_categoryEv[boost::asio::error::get_system_category()]+0x7): undefined reference to `boost::system::get_system_category()' collect2: ld returned 1 exit status Build error occurred, build is stopped Time consumed: 4886 ms. -- View this message in context: http://old.nabble.com/getting-errors-whti-boost.-tp26856283p26856283.html Sent from the Boost - Dev mailing list archive at Nabble.com.