Hi All, Anyone can help me to understand, and fix this error: gcc.link bin/gcc-4.6/release/threading-multi/doksafe_process_engine /usr/bin/ld: bin/gcc-4.6/release/threading-multi/main.o: undefined reference to symbol 'boost::filesystem3::path::wchar_t_codecvt_facet()' /usr/bin/ld: note: 'boost::filesystem3::path::wchar_t_codecvt_facet()' is defined in DSO /3rdparty/Boost/1.46.1/lib/libboost_filesystem.so.1.46.1 so try adding it to the linker command line /3rdparty/Boost/1.46.1/lib/libboost_filesystem.so.1.46.1: could not read symbols: Invalid operation collect2: ld returned 1 exit status Thanks