https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82092
--- Comment #13 from Eric Gallager <egallager at gcc dot gnu.org> --- (In reply to Claus-Justus Heine from comment #12) > Still no go, even with that patch: > > ./auto-host.h:2396:16: error: declaration does not declare anything > [-fpermissive] > #define rlim_t long > > And: > > In file included from > /Users/heinecj/Software/src/gcc-8.1.0/build/prev-x86_64-apple-darwin16.7.0/ > libstdc++-v3/include/cstring:42, > from ../../gcc/system.h:235, > from ../../gcc/genmodes.c:21: > /usr/include/string.h:134:7: note: previous declaration 'char* > strsignal(int)' > char *strsignal(int __sig); > > This is OSX Yosemite with that patch mentioned above applied, > enable-languages=c,c++,fortran and latest mpc, gmp, mpfr, isl. > > Cheers That might be a different issue...