--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/vtls/polarssl_threadlock.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,48 @@
+#ifndef HEADER_CURL_POLARSSL_THREADLOCK_H
+#define HEADER_CURL_POLARSSL_THREADLOCK_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2013-2015, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2010, Hoi-Ho Chan, <hoiho.chan@gmail.com>
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+#include "curl_setup.h"
+
+#if (defined USE_POLARSSL) || (defined USE_MBEDTLS)
+
+#if (defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)) || \
+    (defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H))
+
+int Curl_polarsslthreadlock_thread_setup(void);
+int Curl_polarsslthreadlock_thread_cleanup(void);
+int Curl_polarsslthreadlock_lock_function(int n);
+int Curl_polarsslthreadlock_unlock_function(int n);
+
+#else
+
+#define Curl_polarsslthreadlock_thread_setup() 1
+#define Curl_polarsslthreadlock_thread_cleanup() 1
+#define Curl_polarsslthreadlock_lock_function(x) 1
+#define Curl_polarsslthreadlock_unlock_function(x) 1
+
+#endif /* USE_THREADS_POSIX || USE_THREADS_WIN32 */
+
+#endif /* USE_POLARSSL */
+
+#endif /* HEADER_CURL_POLARSSL_THREADLOCK_H */