https://git.ruby-lang.org/ruby.git/commit/?id=19b0161b85

From 19b0161b851ba32d5bc6c367db5b520d35905d6b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 20 Aug 2019 01:58:45 +0900
Subject: Check whether syscall(2) is deprecated by actual warnings


diff --git a/configure.ac b/configure.ac
index a6231b6..093010d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -794,7 +794,13 @@ AS_CASE(["$target_os"], https://github.com/ruby/ruby/blob/trunk/configure.ac#L794
 		ORIG_LIBS="$LIBS"
 		RUBY_PREPEND_OPTION(LIBS, -lobjc)
 		RUBY_APPEND_OPTIONS(CPPFLAGS, -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT)
-		AS_IF([test "${target_os@%:@darwin}" -ge 16], [
+		AC_CACHE_CHECK([whether syscall(2) is deprecated], rb_cv_syscall_deprecated,
+		    [RUBY_WERROR_FLAG([
+			AC_TRY_COMPILE([@%:@include <unistd.h>],
+				       [if (syscall(0)) return 1;],
+			    [rb_cv_syscall_deprecated=no],
+			    [rb_cv_syscall_deprecated=yes])])])
+		AS_IF([test $rb_cv_syscall_deprecated = yes], [
 		    ac_cv_func___syscall=no
 		    ac_cv_func_syscall=no
 		    ac_cv_header_sys_syscall_h=no
-- 
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