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diff --git a/gfx/vr/service/osvr/Util/ReturnCodesC.h b/gfx/vr/service/osvr/Util/ReturnCodesC.h
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+++ b/gfx/vr/service/osvr/Util/ReturnCodesC.h
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+/** @file
+    @brief Header declaring a type and values for simple C return codes.
+
+    Must be c-safe!
+
+    @date 2014
+
+    @author
+    Sensics, Inc.
+    <http://sensics.com/osvr>
+*/
+
+/*
+// Copyright 2014 Sensics, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+*/
+
+#ifndef INCLUDED_ReturnCodesC_h_GUID_C81A2FDE_E5BB_4AAA_70A4_C616DD7C141A
+#define INCLUDED_ReturnCodesC_h_GUID_C81A2FDE_E5BB_4AAA_70A4_C616DD7C141A
+
+/* Internal Includes */
+#include <osvr/Util/APIBaseC.h>
+#include <osvr/Util/AnnotationMacrosC.h>
+
+OSVR_EXTERN_C_BEGIN
+
+/** @addtogroup PluginKit
+    @{
+*/
+/** @name Return Codes
+    @{
+*/
+/** @brief The "success" value for an OSVR_ReturnCode */
+#define OSVR_RETURN_SUCCESS (0)
+/** @brief The "failure" value for an OSVR_ReturnCode */
+#define OSVR_RETURN_FAILURE (1)
+/** @brief Return type from C API OSVR functions. */
+typedef OSVR_RETURN_SUCCESS_CONDITION(
+    return == OSVR_RETURN_SUCCESS) char OSVR_ReturnCode;
+/** @} */
+
+/** @} */ /* end of group */
+
+OSVR_EXTERN_C_END
+
+#endif