<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">--- a/libteredo/debug.h
+++ b/libteredo/debug.h
@@ -43,8 +43,10 @@ static inline void debug (const char *st
 #  ifdef __linux__
 #   include &lt;errno.h&gt;
 #   include &lt;assert.h&gt;
-#   undef PTHREAD_MUTEX_INITIALIZER
-#   define PTHREAD_MUTEX_INITIALIZER PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
+#   if defined(PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP)
+#     undef PTHREAD_MUTEX_INITIALIZER
+#     define PTHREAD_MUTEX_INITIALIZER PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
+#   endif
 
 static inline int
 d_pthread_mutex_init (pthread_mutex_t *mutex, pthread_mutexattr_t *pattr)
@@ -57,7 +59,7 @@ d_pthread_mutex_init (pthread_mutex_t *m
 		pthread_mutexattr_init (&amp;attr);
 	}
 
-	pthread_mutexattr_settype (pattr, PTHREAD_MUTEX_ERRORCHECK_NP);
+	pthread_mutexattr_settype (pattr, PTHREAD_MUTEX_ERRORCHECK);
 	int res = pthread_mutex_init (mutex, pattr);
 
 	if (pattr == &amp;attr)
</pre></body></html>