Why might cause 'undefined symbol' for typeinfo when loading dynamic library built with C++11 enabled?

Our C++ application, that runs on Linux, links to dynamic libraries built by us. When everything is built using gcc 7.3.0 with switch -std=c++98, the libraries load ok. However, when I build without that switch (i.e. with C++11) I get an undefined symbol:

undefined symbol: _ZTIN8StarLibs7LinkSim2NR13StarOfdmGenNRE ( typeinfo for StarLibs::LinkSim::NR::StarOfdmGenNR )

The demangled symbol name is in brackets.

What could cause missing typeinfo, which is apparently for the class?

The class has methods that return const. Also the class's header file #includes another class's header file and that included class contains some static const members. I tried declaring those members in a separate .cpp file to allocate them storage (that recipe fixed a similar error in another part of the code) but it did not fix this problem.