From a44972742e29621ab1df2c53a51e3a6e489a85f6 Mon Sep 17 00:00:00 2001
From: Sean Parkinson <sean@wolfssl.com>
Date: Wed, 31 Jul 2024 09:52:53 +1000
Subject: [PATCH] Compile flag to not include system headers

Some builds don't require system headers: crypto only and single
threaded.
WOLFSSL_NO_SYSTEM_HEADERS stops wolfSSL including system headers.
---
 wolfssl/wolfcrypt/wc_port.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/wolfssl/wolfcrypt/wc_port.h b/wolfssl/wolfcrypt/wc_port.h
index 0cf0eea656..a8f36db2a6 100644
--- a/wolfssl/wolfcrypt/wc_port.h
+++ b/wolfssl/wolfcrypt/wc_port.h
@@ -59,7 +59,12 @@
 #endif /* WOLFSSL_LINUXKM */
 
 /* THREADING/MUTEX SECTION */
-#ifdef USE_WINDOWS_API
+#if defined(WOLFSSL_NO_SYSTEM_HEADERS)
+    #ifndef SINGLE_THREADED
+        #error "Configure as single threaded."
+    #endif
+    /* No system headers required for build. */
+#elif defined(USE_WINDOWS_API)
     #if defined(WOLFSSL_PTHREADS)
         #include <pthread.h>
     #endif