boost_lock linker error

`.text._ZN5boost16exception_detail19error_info_injectorINS_10lock_errorEED2Ev' referenced in section `.text._ZN5boost16exception_detail19error_info_injectorINS_10lock_errorEED1Ev[non-virtual thunk to boost::exception_detail::error_info_injector<boost::lock_error>::~error_info_injector()]' of /usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../lib/libMyGUI.OgrePlatform.a(MyGUI_OgreDataManager.cpp.o): defined in discarded section `.text._ZN5boost16exception_detail19error_info_injectorINS_10lock_errorEED2Ev[_ZN5boost16exception_detail19error_info_injectorINS_10lock_errorEED5Ev]' of /usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../lib/libMyGUI.OgrePlatform.a(MyGUI_OgreDataManager.cpp.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_10lock_errorEEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_10lock_errorEEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::lock_error> >::~clone_impl()]' of /usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../lib/libMyGUI.OgrePlatform.a(MyGUI_OgreDataManager.cpp.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_10lock_errorEEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_10lock_errorEEEED5Ev]' of /usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../lib/libMyGUI.OgrePlatform.a(MyGUI_OgreDataManager.cpp.o)
`.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_10lock_errorEEEED2Ev' referenced in section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_10lock_errorEEEED1Ev[non-virtual thunk to boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::lock_error> >::~clone_impl()]' of /usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../lib/libMyGUI.OgrePlatform.a(MyGUI_OgreDataManager.cpp.o): defined in discarded section `.text._ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_10lock_errorEEEED2Ev[_ZN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_10lock_errorEEEED5Ev]' of /usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../lib/libMyGUI.OgrePlatform.a(MyGUI_OgreDataManager.cpp.o)
collect2: ld returned 1 exit status