https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69383
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #2) > 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. That would mean they don't get a non-conforming <stdlib.h> because they would circumvent the fix for PR60401, but I doubt non-conformance will worry them. It might be the simplest hack to compile again, although I wouldn't call it a fix.