CC       src/bson/libbson_la-bson-context.lo
src/bson/bson-context.c:53:11: warning: 'syscall' is deprecated: first deprecated in macOS 10.12 - syscall(2) is unsupported; please switch to a supported interface. For SYS_kdebug_trace use
      kdebug_signpost(). [-Wdeprecated-declarations]
   return syscall (SYS_gettid);
          ^
/usr/include/unistd.h:733:6: note: 'syscall' has been explicitly marked deprecated here
int      syscall(int, ...);
         ^
1