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diff --git a/src/interface.h b/src/interface.h
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+/*******************************************************************************
+  XDG desktop portal implementation for TDE
+  Copyright © 2024 Mavridis Philippe <[email protected]>
+
+  This program or library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more
+  details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with this library; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+  Improvements and feedback are welcome!
+*******************************************************************************/
+
+/* Common definitions and includes for portal interfaces */
+#ifndef __INTERFACE_H_
+#define __INTERFACE_H_
+
+// TQt
+#include <tqdbusconnection.h>
+#include <tqdbusmessage.h>
+#include <tqdbusvariant.h>
+#include <tqdbusdatalist.h>
+#include <tqdbusdata.h>
+#include <tqdbuserror.h>
+#include <tqobject.h>
+
+// Portal
+#include "util.h"
+
+#define INTERFACE(x) \
+    public: \
+        static const TQCString interface() { return x; }
+
+
+#define OPTION_VALID(opt, sig) \
+    options.keys().contains(opt) && check_variant(options[opt], sig)
+
+#endif // __INTERFACE_H_
+\ No newline at end of file