diff --git a/ext/standard/proc_open.c b/ext/standard/proc_open.c
index ddce144161ca..319f11fd1e72 100644
--- a/ext/standard/proc_open.c
+++ b/ext/standard/proc_open.c
@@ -1,14 +1,12 @@
 /*
    +----------------------------------------------------------------------+
-   | Copyright (c) The PHP Group                                          |
+   | Copyright © The PHP Group and Contributors.                          |
    +----------------------------------------------------------------------+
-   | This source file is subject to version 3.01 of the PHP license,      |
-   | that is bundled with this package in the file LICENSE, and is        |
-   | available through the world-wide-web at the following url:           |
-   | https://www.php.net/license/3_01.txt                                 |
-   | If you did not receive a copy of the PHP license and are unable to   |
-   | obtain it through the world-wide-web, please send a note to          |
-   | license@php.net so we can mail you a copy immediately.               |
+   | This source file is subject to the Modified BSD License that is      |
+   | bundled with this package in the file LICENSE, and is available      |
+   | through the World Wide Web at <https://www.php.net/license/>.        |
+   |                                                                      |
+   | SPDX-License-Identifier: BSD-3-Clause                                |
    +----------------------------------------------------------------------+
    | Author: Wez Furlong <wez@thebrainroom.com>                           |
    +----------------------------------------------------------------------+
@@ -44,10 +42,17 @@
  * to be really buggy.
  */
 #include <spawn.h>
+#ifdef __APPLE__
+#include <AvailabilityMacros.h>
+#endif
 #define USE_POSIX_SPAWN
 
 /* The non-_np variant is in macOS 26 (and _np deprecated) */
-#ifdef HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR
+#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED >= 260000
+#define POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR posix_spawn_file_actions_addchdir
+#elif defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED < 260000
+#define POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR posix_spawn_file_actions_addchdir_np
+#elif HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR
 #define POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR posix_spawn_file_actions_addchdir
 #else
 #define POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR posix_spawn_file_actions_addchdir_np
@@ -1573,4 +1578,4 @@ PHP_FUNCTION(proc_open)
 }
 /* }}} */
 
-#endif /* PHP_CAN_SUPPORT_PROC_OPEN */
+#endif /* PHP_CAN_SUPPORT_PROC_OPEN */
\ No newline at end of file