nobu	2017-03-25 16:46:12 +0900 (Sat, 25 Mar 2017)

  New Revision: 58084

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58084

  Log:
    configure.in: syscall is deprecated on macOS
    
    * configure.in: syscall is no longer supported on macOS since
      10.12.  [ruby-core:80300] [Bug #13361]

  Modified files:
    trunk/configure.in
Index: configure.in
===================================================================
--- configure.in	(revision 58083)
+++ configure.in	(revision 58084)
@@ -1100,6 +1100,12 @@ AS_CASE(["$target_os"], https://github.com/ruby/ruby/blob/trunk/configure.in#L1100
 		    ],
 		    [macosx_10_5=yes], [macosx_10_5=no])
 		AC_MSG_RESULT($macosx_10_5)
+		AS_IF([test "${target_os@%:@darwin}" -ge 16], [
+		    ac_cv_func___syscall=no
+		    ac_cv_func_syscall=no
+		    ac_cv_header_sys_syscall_h=no
+		    ac_cv_header_syscall_h=no
+		])
 		if test $macosx_10_5 = yes; then
 		    ac_cv_func_getcontext=no
 		    ac_cv_func_setcontext=no

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