I just made a new clone of tz. I work normally on RHEL 7 (redhat enterprise Linux) with gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) When I say make or make all, I get something I never observed before: cc -DTZDIR='"/usr/share/zoneinfo"' -c -o zic.o zic.c In file included from zic.c:16:0: private.h:791:60: error: conflicting types for ‘restrict’ struct tm *localtime_rz(timezone_t restrict, time_t const *restrict, ^ private.h:791:36: note: previous definition of ‘restrict’ was here struct tm *localtime_rz(timezone_t restrict, time_t const *restrict, ^ private.h:792:15: error: conflicting types for ‘restrict’ struct tm *restrict); ^ private.h:791:60: note: previous definition of ‘restrict’ was here struct tm *localtime_rz(timezone_t restrict, time_t const *restrict, ^ private.h:793:49: error: conflicting types for ‘restrict’ time_t mktime_z(timezone_t restrict, struct tm *restrict); ^ private.h:793:28: note: previous definition of ‘restrict’ was here time_t mktime_z(timezone_t restrict, struct tm *restrict); This does not happen when I compile on RHEL 9 gcc version 11.4.1 20230605 (Red Hat 11.4.1-2) (GCC) Can anyone point me to a fix?