--- xnu/xnu-344.26/libkern/c++/OSUnserialize.cpp
+++ xnu/xnu-124.1/libkern/c++/OSUnserialize.cpp
@@ -124,6 +124,7 @@
 #ifndef YYSTYPE
 #define YYSTYPE int
 #endif
+#include <stddef.h>
 
 #ifndef __cplusplus
 #ifndef __STDC__
@@ -1566,9 +1567,9 @@
 
 	if (!lock) {
 		lock = mutex_alloc(ETAP_IO_AHA);
-		mutex_lock(lock);
+		_mutex_lock(lock);
 	} else {
-		mutex_lock(lock);
+		_mutex_lock(lock);
 
 	}