diff --git a/mozilla/xpfe/appshell/macbuild/AppShellSharedPrefix.h b/mozilla/xpfe/appshell/macbuild/AppShellSharedPrefix.h
new file mode 100644
index 00000000000..04a443c3f5d
--- /dev/null
+++ b/mozilla/xpfe/appshell/macbuild/AppShellSharedPrefix.h
@@ -0,0 +1,22 @@
+/* -*- 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.
+ */
+
+/* Defining the following causes NS_APPSHELL to be defined as NS_EXPORT. */
+#define _IMPL_NS_APPSHELL
+
+#include "MacSharedPrefix_debug.h"
diff --git a/mozilla/xpfe/appshell/macbuild/AppShellSharedPrefix_debug.h b/mozilla/xpfe/appshell/macbuild/AppShellSharedPrefix_debug.h
new file mode 100644
index 00000000000..1e1cf92bc5e
--- /dev/null
+++ b/mozilla/xpfe/appshell/macbuild/AppShellSharedPrefix_debug.h
@@ -0,0 +1,22 @@
+/* -*- 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.
+ */
+
+/* Defining the following causes NS_APPSHELL to be defined as NS_EXPORT. */
+#define _IMPL_NS_APPSHELL
+
+#include "MacSharedPrefix.h"