diff --git a/mozilla/xpcom/libxpt/macbuild/libxpt.Prefix b/mozilla/xpcom/libxpt/macbuild/libxpt.Prefix
new file mode 100644
index 00000000000..36b66606097
--- /dev/null
+++ b/mozilla/xpcom/libxpt/macbuild/libxpt.Prefix
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 4; 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.
+ */
+
+//
+//	libxpt.Prefix
+//
+// Global prefix file for the libxpt project.
+//
+
+#include "MacPrefix.h"
+#include "libxptConfig.h"
diff --git a/mozilla/xpcom/libxpt/macbuild/libxpt.mcp b/mozilla/xpcom/libxpt/macbuild/libxpt.mcp
new file mode 100644
index 00000000000..023ce61d9e3
Binary files /dev/null and b/mozilla/xpcom/libxpt/macbuild/libxpt.mcp differ
diff --git a/mozilla/xpcom/libxpt/macbuild/libxptConfig.h b/mozilla/xpcom/libxpt/macbuild/libxptConfig.h
new file mode 100644
index 00000000000..c19539fb824
--- /dev/null
+++ b/mozilla/xpcom/libxpt/macbuild/libxptConfig.h
@@ -0,0 +1,19 @@
+/* -*- Mode: C++; tab-width: 4; 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.
+ */
+
+/* Nothing to do here. Add libxpt-specific defines here if necessary */
diff --git a/mozilla/xpcom/libxpt/macbuild/libxptDebug.Prefix b/mozilla/xpcom/libxpt/macbuild/libxptDebug.Prefix
new file mode 100644
index 00000000000..53433cb3da4
--- /dev/null
+++ b/mozilla/xpcom/libxpt/macbuild/libxptDebug.Prefix
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 4; 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.
+ */
+
+//
+//	libxptDebug.Prefix
+//
+// Global prefix file for the libxpt project.
+//
+
+#include "MacPrefix_debug.h"
+#include "libxptConfig.h"
diff --git a/mozilla/xpcom/typelib/xpt/macbuild/libxpt.Prefix b/mozilla/xpcom/typelib/xpt/macbuild/libxpt.Prefix
new file mode 100644
index 00000000000..36b66606097
--- /dev/null
+++ b/mozilla/xpcom/typelib/xpt/macbuild/libxpt.Prefix
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 4; 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.
+ */
+
+//
+//	libxpt.Prefix
+//
+// Global prefix file for the libxpt project.
+//
+
+#include "MacPrefix.h"
+#include "libxptConfig.h"
diff --git a/mozilla/xpcom/typelib/xpt/macbuild/libxpt.mcp b/mozilla/xpcom/typelib/xpt/macbuild/libxpt.mcp
new file mode 100644
index 00000000000..023ce61d9e3
Binary files /dev/null and b/mozilla/xpcom/typelib/xpt/macbuild/libxpt.mcp differ
diff --git a/mozilla/xpcom/typelib/xpt/macbuild/libxptConfig.h b/mozilla/xpcom/typelib/xpt/macbuild/libxptConfig.h
new file mode 100644
index 00000000000..c19539fb824
--- /dev/null
+++ b/mozilla/xpcom/typelib/xpt/macbuild/libxptConfig.h
@@ -0,0 +1,19 @@
+/* -*- Mode: C++; tab-width: 4; 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.
+ */
+
+/* Nothing to do here. Add libxpt-specific defines here if necessary */
diff --git a/mozilla/xpcom/typelib/xpt/macbuild/libxptDebug.Prefix b/mozilla/xpcom/typelib/xpt/macbuild/libxptDebug.Prefix
new file mode 100644
index 00000000000..53433cb3da4
--- /dev/null
+++ b/mozilla/xpcom/typelib/xpt/macbuild/libxptDebug.Prefix
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 4; 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.
+ */
+
+//
+//	libxptDebug.Prefix
+//
+// Global prefix file for the libxpt project.
+//
+
+#include "MacPrefix_debug.h"
+#include "libxptConfig.h"