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diff --git a/third_party/aom/aom_ports/system_state.h b/third_party/aom/aom_ports/system_state.h
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_PORTS_SYSTEM_STATE_H_
+#define AOM_PORTS_SYSTEM_STATE_H_
+
+#include "./aom_config.h"
+
+#if ARCH_X86 || ARCH_X86_64
+void aom_reset_mmx_state(void);
+#define aom_clear_system_state() aom_reset_mmx_state()
+#else
+#define aom_clear_system_state()
+#endif // ARCH_X86 || ARCH_X86_64
+#endif // AOM_PORTS_SYSTEM_STATE_H_