QT编译出现动态链接库undefined reference to `std::@GLIBCXX_3.4.21'
编译时出现的问题liboctomap.so:undefinedreferenceto`std::basic_istream>&std::operator>>,std::allocator>(std::basic_istream>&,std::__cxx11::basic_string,std::allocator>&)@GLIBCXX_3.4.21'liboctomap.so:undefinedr