https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101867
--- Comment #6 from cqwrteur <unlvsur at live dot com> --- Created attachment 51295 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51295&action=edit errors with --with-avr i just find --with-avr toggle in the libstdc++'s configure. but it has other issues here.