https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67478
--- Comment #10 from David Edelsohn <dje at gcc dot gnu.org> --- The libstdc++ build process was updated to recognize LTS symbols. Please use GCC 5.3 or later.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67478
--- Comment #10 from David Edelsohn <dje at gcc dot gnu.org> --- The libstdc++ build process was updated to recognize LTS symbols. Please use GCC 5.3 or later.