https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69383
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Firefox could use #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS #include_next <stdlib.h> #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS instead of just #include_next <stdlib.h> to get the old behavior I guess.
