g2o 编译错误 "std" 解析错误

The following error occurred when compiling g2o: usr/include/c++/9/bits/functexcept.:42: Parse error at "std" make[2]: *** [g2o/apps/g2o_viewer/CMakeFiles/viewer_library.dir/build.make:74: g2o/apps/g2o_viewer/moc_properties_widget.cpp] Error 1 make[2]: *** Waiting for unfinished jobs.... usr/include/c++/9/bits/cpp_type_traits.:69: Parse error at "std" make[2]: *** [g2o/apps/g2o_viewer/CMakeFiles/viewer_library.dir/build.make:70: g2o/apps/g2o_viewer/moc_main_window.cpp] Error 1 make[1]: *** [CMakeFiles/Makefile2:1559: g2o/apps/g2o_viewer/CMakeFiles/viewer_library.dir/all] Error 2 make[1]: *** Waiting for unfinished jobs....