mkv.cpp: avoid dependency problems with older libmatroska

diff --git a/modules/demux/mkv.cpp b/modules/demux/mkv.cpp
index 870b63db7b076d2640a0242053b89f25d266c1bc..b066d7f20f23a075c291153f249dc823e597cec8 100644 (file)
--- a/modules/demux/mkv.cpp
+++ b/modules/demux/mkv.cpp
@@ -84,6 +84,12 @@
 
 #include "ebml/StdIOCallback.h"
 
+#if LIBMATROSKA_VERSION < 0x000706
+START_LIBMATROSKA_NAMESPACE
+extern const EbmlSemanticContext MATROSKA_DLL_API KaxMatroska_Context;
+END_LIBMATROSKA_NAMESPACE
+#endif
+
 #include "vlc_keys.h"
 
 extern "C" {