diff --git a/mozilla/lib/mac/MacMemoryAllocator/src/nsGCStubs.c b/mozilla/lib/mac/MacMemoryAllocator/src/nsGCStubs.c
new file mode 100644
index 00000000000..152dade156d
--- /dev/null
+++ b/mozilla/lib/mac/MacMemoryAllocator/src/nsGCStubs.c
@@ -0,0 +1,55 @@
+/* -*- Mode: C++;    tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- 
+ * 
+ * The contents of this file are subject to the Netscape Public License 
+ * Version 1.0 (the "NPL"); you may not use this file except in 
+ * compliance with the NPL. You may obtain a copy of the NPL at  
+ * http://www.mozilla.org/NPL/ 
+ * 
+ * Software distributed under the NPL is distributed on an "AS IS" basis, 
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL 
+ * for the specific language governing rights and limitations under the 
+ * NPL. 
+ * 
+ * The Initial Developer of this code under the NPL is Netscape 
+ * Communications Corporation. Portions created by Netscape are 
+ * Copyright (C) 1998 Netscape Communications Corporation. All Rights    
+ * Reserved. */
+
+#include <Files.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "gc.h"
+#include "gc_fragments.h"
+#include "generic_threads.h"
+
+#ifndef GC_LEAK_DETECTOR
+
+void MWUnmangle(const char *mangled_name, char *unmangled_name, size_t buffersize);
+
+// stub implementations, when GC leak detection isn't on. these are needed so that
+// NSStdLib has something to export for these functions, even when the GC isn't used.
+void GC_register_fragment(char* dataStart, char* dataEnd,
+                          char* codeStart, char* codeEnd,
+                          const FSSpec* fragmentSpec) {}
+void GC_unregister_fragment(char* dataStart, char* dataEnd,
+                            char* codeStart, char* codeEnd) {}
+void GC_clear_roots() {}
+void GC_generic_init_threads() {}
+void GC_gcollect() {}
+
+FILE* GC_stdout = NULL;
+FILE* GC_stderr = NULL;
+
+int GC_address_to_source(char* codeAddr, char fileName[256], UInt32* fileOffset)
+{
+	return 0;
+}
+
+void MWUnmangle(const char *mangled_name, char *unmangled_name, size_t buffersize)
+{
+	strncpy(unmangled_name, mangled_name, buffersize);
+}
+
+#endif