diff --git a/mozilla/xpcom/typelib/xpidl/macbuild/xpidl_mpw_prefix.h b/mozilla/xpcom/typelib/xpidl/macbuild/xpidl_mpw_prefix.h
new file mode 100755
index 00000000000..7bb541b2ead
--- /dev/null
+++ b/mozilla/xpcom/typelib/xpidl/macbuild/xpidl_mpw_prefix.h
@@ -0,0 +1,9 @@
+#include <ansi_prefix.mac.h>
+
+#define XP_MAC
+
+#define LIBIDL_LIBRARY_VERSION		"0.6.5"
+#define CPP_PROGRAM					"Foobar"
+
+#define OTUNIXERRORS	1
+#include <OpenTransport.h>