+// SDK 9.0 compile time feature checks
+#if NVENCAPI_CHECK_VERSION(9, 0)
+#define NVENC_HAVE_HEVC_BFRAME_REF_MODE
+#endif
+
+// SDK 9.1 compile time feature checks
+#if NVENCAPI_CHECK_VERSION(9, 1)
+#define NVENC_HAVE_MULTIPLE_REF_FRAMES
+#define NVENC_HAVE_CUSTREAM_PTR
+#define NVENC_HAVE_GETLASTERRORSTRING
+#endif
+