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diff --git a/gfx/vr/osvr/Util/QuaternionC.h b/gfx/vr/osvr/Util/QuaternionC.h
new file mode 100644
index 000000000..8056c89a0
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+++ b/gfx/vr/osvr/Util/QuaternionC.h
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+/** @file
+    @brief Header
+
+    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_QuaternionC_h_GUID_1470A5FE_8209_41A6_C19E_46077FDF9C66
+#define INCLUDED_QuaternionC_h_GUID_1470A5FE_8209_41A6_C19E_46077FDF9C66
+
+/* Internal Includes */
+#include <osvr/Util/APIBaseC.h>
+
+/* Library/third-party includes */
+/* none */
+
+/* Standard includes */
+/* none */
+
+OSVR_EXTERN_C_BEGIN
+
+/** @addtogroup UtilMath
+    @{
+*/
+/** @brief A structure defining a quaternion, often a unit quaternion
+ * representing 3D rotation.
+*/
+typedef struct OSVR_Quaternion {
+    /** @brief Internal data - direct access not recommended */
+    double data[4];
+} OSVR_Quaternion;
+
+#define OSVR_QUAT_MEMBER(COMPONENT, INDEX)                                     \
+    /** @brief Accessor for quaternion component COMPONENT */                  \
+    OSVR_INLINE double osvrQuatGet##COMPONENT(OSVR_Quaternion const *q) {      \
+        return q->data[INDEX];                                                 \
+    }                                                                          \
+    /** @brief Setter for quaternion component COMPONENT */                    \
+    OSVR_INLINE void osvrQuatSet##COMPONENT(OSVR_Quaternion *q, double val) {  \
+        q->data[INDEX] = val;                                                  \
+    }
+
+OSVR_QUAT_MEMBER(W, 0)
+OSVR_QUAT_MEMBER(X, 1)
+OSVR_QUAT_MEMBER(Y, 2)
+OSVR_QUAT_MEMBER(Z, 3)
+
+#undef OSVR_QUAT_MEMBER
+
+/** @brief Set a quaternion to the identity rotation */
+OSVR_INLINE void osvrQuatSetIdentity(OSVR_Quaternion *q) {
+    osvrQuatSetW(q, 1);
+    osvrQuatSetX(q, 0);
+    osvrQuatSetY(q, 0);
+    osvrQuatSetZ(q, 0);
+}
+
+/** @} */
+
+OSVR_EXTERN_C_END
+
+#ifdef __cplusplus
+template <typename StreamType>
+inline StreamType &operator<<(StreamType &os, OSVR_Quaternion const &quat) {
+    os << "(" << osvrQuatGetW(&quat) << ", (" << osvrQuatGetX(&quat) << ", "
+       << osvrQuatGetY(&quat) << ", " << osvrQuatGetZ(&quat) << "))";
+    return os;
+}
+#endif
+
+#endif