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diff --git a/lib/interfaces/extensions/kdevdifffrontend.h b/lib/interfaces/extensions/kdevdifffrontend.h
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+++ b/lib/interfaces/extensions/kdevdifffrontend.h
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+/* This file is part of the KDE project
+   Copyright (C) 2002 Harald Fernengel <harry@kdevelop.org>
+   Copyright (C) 2002 F@lk Brettschneider <falkbr@kdevelop.org>
+   Copyright (C) 2003 Roberto Raggi <roberto@kdevelop.org>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this library; see the file COPYING.LIB.  If not, write to
+   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+#ifndef KDEVDIFFFRONTEND_H
+#define KDEVDIFFFRONTEND_H
+
+#include <kurl.h>
+#include <kdevplugin.h>
+
+/**
+@file kdevdifffrontend.h
+Diff frontend interface.
+*/
+
+/**
+KDevelop diff frontend interface.
+This is the abstract base class for plugins that want to display differencies between
+files.
+
+Instances that implement this interface are available through extension architecture:
+@code
+KDevDiffFrontend *df = extension<KDevDiffFrontend>("TDevelop/DiffFrontend");
+if (df) {
+    // do something
+} else {
+    // fail
+}
+@endcode
+@sa KDevPlugin::extension method documentation.
+*/
+class KDevDiffFrontend : public KDevPlugin
+{
+
+public:
+    /**Constructor.
+    @param info Important information about the plugin - plugin internal and generic
+    (GUI) name, description, a list of authors, etc. That information is used to show
+    plugin information in various places like "about application" dialog, plugin selector
+    dialog, etc. Plugin does not take ownership on info object, also its lifetime should
+    be equal to the lifetime of the plugin.
+    @param parent The parent object for the plugin. Parent object must implement @ref KDevApi
+    interface. Otherwise the plugin will not be constructed.
+    @param name The internal name which identifies the plugin.*/
+    KDevDiffFrontend( const KDevPluginInfo *info, TQObject *parent=0, const char *name=0 )
+        :KDevPlugin(info, parent, name ? name : "KDevDiffFrontend") {}
+
+    /**Displays the patch.
+    @param diff A string which contains a patch in unified format.*/
+    virtual void showDiff( const TQString& diff ) = 0;
+
+    /**Displays a patch file.
+    @param url An url of the patch file.*/
+    virtual void openURL( const KURL &url ) = 0;
+
+    /**Displays the difference between the two files.
+    @param url1 First file to compare.
+    @param url2 Second file to compare.*/
+    virtual void showDiff( const KURL &url1, const KURL &url2 ) = 0;
+
+};
+
+#endif