From 1190e0c053b92d752db7d9d49f51bbba5c93f475 Mon Sep 17 00:00:00 2001
From: Tim Blechmann <tim@klingt.org>
Date: Wed, 26 Aug 2020 11:47:24 +0800
Subject: [PATCH] iOS compile fix

`crt_externs.h` is available only available with iOS-13 sdk. we
therefore add a `__has_include` check to see if it is actually available
---
 src/options.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/options.c b/src/options.c
index f29b387c..68aeb1df 100644
--- a/src/options.c
+++ b/src/options.c
@@ -422,7 +422,7 @@ static bool mi_getenv(const char* name, char* result, size_t result_size) {
 #elif !defined(MI_USE_ENVIRON) || (MI_USE_ENVIRON!=0)
 // On Posix systemsr use `environ` to acces environment variables 
 // even before the C runtime is initialized.
-#if defined(__APPLE__)
+#if defined(__APPLE__) && defined(__has_include) && __has_include(<crt_externs.h>)
 #include <crt_externs.h>
 static char** mi_get_environ(void) {
   return (*_NSGetEnviron());