https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107059
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- With fixincludes enabled? If yes, has bits/floatn.h and bits/floatn-common.h been fixincluded? The #c0 case is clearly a Debian-like setup that should have been fixed with r13-2896