https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64435
--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> --- In the #c9 patch obviously I meant to write __GLIBC_PREREQ (2, 21) instead of __GNUC_PREREQ (2, 21), finger memory apparently doesn't work always well. And there probably needs to be #ifndef __GLIBC_PREREQ #define __GLIBC_PREREQ(major, minor) 0 #endif somewhere before that, as otherwise it will fail on non-Linux.
