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diff --git a/src/libs/xpcom18a4/xpcom/base/nsISupportsBase.h b/src/libs/xpcom18a4/xpcom/base/nsISupportsBase.h
new file mode 100644
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+++ b/src/libs/xpcom18a4/xpcom/base/nsISupportsBase.h
@@ -0,0 +1,119 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is XPCOM.
+ *
+ * The Initial Developer of the Original Code is Netscape Communications Corp.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsISupportsBase_h__
+#define nsISupportsBase_h__
+
+#ifndef nscore_h___
+#include "nscore.h"
+#endif
+
+#ifndef nsID_h__
+#include "nsID.h"
+#endif
+
+
+/*@{*/
+/**
+ * IID for the nsISupports interface
+ * {00000000-0000-0000-c000-000000000046}
+ *
+ * To maintain binary compatibility with COM's IUnknown, we define the IID
+ * of nsISupports to be the same as that of COM's IUnknown.
+ */
+#define NS_ISUPPORTS_IID                                                      \
+  { 0x00000000, 0x0000, 0x0000,                                               \
+    {0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46} }
+
+/**
+ * Reference count values
+ *
+ * This is the return type for AddRef() and Release() in nsISupports.
+ * IUnknown of COM returns an unsigned long from equivalent functions.
+ * The following ifdef exists to maintain binary compatibility with
+ * IUnknown.
+ */
+#if defined(XP_WIN) && PR_BYTES_PER_LONG == 4
+typedef unsigned long nsrefcnt;
+#else
+typedef PRUint32 nsrefcnt;
+#endif
+
+/**
+ * Basic component object model interface. Objects which implement
+ * this interface support runtime interface discovery (QueryInterface)
+ * and a reference counted memory model (AddRef/Release). This is
+ * modelled after the win32 IUnknown API.
+ */
+class NS_NO_VTABLE nsISupports {
+public:
+
+  /**
+   * @name Methods
+   */
+
+  //@{
+  /**
+   * A run time mechanism for interface discovery.
+   * @param aIID [in] A requested interface IID
+   * @param aInstancePtr [out] A pointer to an interface pointer to
+   * receive the result.
+   * @return <b>NS_OK</b> if the interface is supported by the associated
+   * instance, <b>NS_NOINTERFACE</b> if it is not.
+   * <b>NS_ERROR_INVALID_POINTER</b> if <i>aInstancePtr</i> is <b>NULL</b>.
+   */
+  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) = 0;
+  /**
+   * Increases the reference count for this interface.
+   * The associated instance will not be deleted unless
+   * the reference count is returned to zero.
+   *
+   * @return The resulting reference count.
+   */
+  NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
+
+  /**
+   * Decreases the reference count for this interface.
+   * Generally, if the reference count returns to zero,
+   * the associated instance is deleted.
+   *
+   * @return The resulting reference count.
+   */
+  NS_IMETHOD_(nsrefcnt) Release(void) = 0;
+
+  //@}
+};
+/*@}*/
+#endif