Helo, when i try to compile my program: ************************************** #include <boost/filesystem.hpp> int main() {} ************************************* I get these errors: obj\Debug\main.o||In function `_Z41__static_initialization_and_destruction_0ii':| C:\CodeBlocks\include\boost-1_35\boost\system\error_code.hpp|204|undefined reference to `boost::system::get_system_category()'| C:\CodeBlocks\include\boost-1_35\boost\system\error_code.hpp|205|undefined reference to `boost::system::get_posix_category()'| C:\CodeBlocks\include\boost-1_35\boost\system\error_code.hpp|209|undefined reference to `boost::system::get_posix_category()'| C:\CodeBlocks\include\boost-1_35\boost\system\error_code.hpp|210|undefined reference to `boost::system::get_system_category()'| What could be the problem?