extern const __DRIcopySubBufferExtension driCopySubBufferExtension;
extern const __DRIswapControlExtension driSwapControlExtension;
extern const __DRIframeTrackingExtension driFrameTrackingExtension;
+extern const __DRImediaStreamCounterExtension driMediaStreamCounterExtension;
/**
* Used by DRI_VALIDATE_DRAWABLE_INFO