patch-xopen-source-ios-legacy.patch

diff --git a/configure.ac b/configure.ac
index aa515da465..2feb013926 100644
--- a/configure.ac
+++ b/configure.ac
@@ -521,6 +521,12 @@ case $ac_sys_system/$ac_sys_release in
     define_xopen_source=no;;
   Darwin/@<:@[12]@:>@@<:@0-9@:>@.*)
     define_xopen_source=no;;
+  iOS/*)
+    define_xopen_source=no;;
+  tvOS/*)
+    define_xopen_source=no;;
+  watchOS/*)
+    define_xopen_source=no;;
   # On AIX 4 and 5.1, mbstate_t is defined only when _XOPEN_SOURCE == 500 but
   # used in wcsnrtombs() and mbsnrtowcs() even if _XOPEN_SOURCE is not defined
   # or has another value. By not (re)defining it, the defaults come in place.