diff --git a/netwerk/streamconv/macbuild/multiMixedConv.mcp b/netwerk/streamconv/macbuild/multiMixedConv.mcp
new file mode 100644
index 000000000000..c335d8372ffb
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diff --git a/netwerk/streamconv/macbuild/streamconv.mcp b/netwerk/streamconv/macbuild/streamconv.mcp
new file mode 100644
index 000000000000..b26cf69b3edd
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diff --git a/netwerk/streamconv/macbuild/streamconvIDL.mcp b/netwerk/streamconv/macbuild/streamconvIDL.mcp
new file mode 100644
index 000000000000..782ab1d5a4e0
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diff --git a/netwerk/streamconv/macbuild/streamconvPrefix.h b/netwerk/streamconv/macbuild/streamconvPrefix.h
new file mode 100644
index 000000000000..87e91fa6c0b2
--- /dev/null
+++ b/netwerk/streamconv/macbuild/streamconvPrefix.h
@@ -0,0 +1,20 @@
+/* -*- 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) 1999 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+
+#include "MacSharedPrefix.h"
diff --git a/netwerk/streamconv/macbuild/streamconvPrefix_debug.h b/netwerk/streamconv/macbuild/streamconvPrefix_debug.h
new file mode 100644
index 000000000000..fcfd0b01f675
--- /dev/null
+++ b/netwerk/streamconv/macbuild/streamconvPrefix_debug.h
@@ -0,0 +1,20 @@
+/* -*- 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) 1999 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+
+#include "MacSharedPrefix_debug.h"