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diff --git a/src/jack_impl.h b/src/jack_impl.h
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+// Copyright 2007-2024 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#ifndef JALV_JACK_IMPL_H
+#define JALV_JACK_IMPL_H
+
+#include "attributes.h"
+#include "process.h"
+#include "settings.h"
+#include "urids.h"
+
+#include <jack/types.h>
+#include <zix/sem.h>
+
+#include <stdbool.h>
+
+// Definition of Jack backend structure (private to implementation)
+JALV_BEGIN_DECLS
+
+struct JalvBackendImpl {
+  const JalvURIDs* urids;              ///< Application vocabulary
+  JalvSettings*    settings;           ///< Run settings
+  JalvProcess*     process;            ///< Process thread state
+  ZixSem*          done;               ///< Shutdown semaphore
+  jack_client_t*   client;             ///< Jack client
+  bool             is_internal_client; ///< Running inside jackd
+};
+
+JALV_END_DECLS
+
+#endif // JALV_JACK_IMPL_H