While trying to create an intermediate dynamic library on OS X 10.4.11 (Intel) that utilizes boost::file_system I receive the following link errors: Linking CXX shared library Bin/libMXADataModel.dylib xilibtool: executing 'libtool' ld: common symbols not allowed with MH_DYLIB output format with the - multi_module option CMakeFiles/MXADataModel.dir/src/HDF5/H5MXADataFile.o definition of common __ZZN5boost10filesystem12initial_pathINS0_10basic_pathISbIwSt11char_trai tsIwESaIwEENS0_12wpath_traitsEEEEERKT_vE9init_path (size 16) CMakeFiles/MXADataModel.dir/src/HDF5/H5MXADataFile.o definition of common __ZZN5boost10filesystem12initial_pathINS0_10basic_pathISsNS0_11path_trai tsEEEEERKT_vE9init_path (size 16) CMakeFiles/MXADataModel.dir/src/HDF5/H5MXADataFile.o definition of common __ZZN5boost10filesystem6detail14remove_all_auxINS0_10basic_pathISbIwSt11 char_traitsIwESaIwEENS0_12wpath_traitsEEEEEmRKT_E7end_itr (size 16) CMakeFiles/MXADataModel.dir/src/HDF5/H5MXADataFile.o definition of common __ZZN5boost10filesystem6detail14remove_all_auxINS0_10basic_pathISsNS0_11 path_traitsEEEEEmRKT_E7end_itr (size 16) libtool: internal link edit command failed make[2]: *** [Bin/libMXADataModel.dylib] Error 1 make[1]: *** [CMakeFiles/MXADataModel.dir/all] Error 2 make: *** [all] Error 2 This is reproducible on the system by simply including boost/ filesystem/operations.hpp in any file that is built into the library. Thanks for your attention to this bug. I have also submitted this as bug #1613. ------------- Mike Jackson Senior Software Engineer IMTS.us