g2o 编译 error Parse error at "std"

[Teresa-Teng]

编译g2o时出现下面的错误，
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....

是qt 的moc 工具在 生成下面的cpp 文件时出现错误
[ 45%] Generating moc_properties_widget.cpp
[ 46%] Generating moc_main_window.cpp

但是搜索不到解决办法。

[BTREE-C802]

您好，我叫旷鸿章，我已经收到了你的邮件。谢谢！