Fix macOS build.

diff --git a/src/lib/image_store.h b/src/lib/image_store.h
index ebe1154530857087e1c224bb8a1513585df891d5..365e7e4f60320dae7403825987ff6c9fb577a864 100644 (file)
--- a/src/lib/image_store.h
+++ b/src/lib/image_store.h
@@ -23,7 +23,7 @@
 #include <map>
 
 
-class AVBufferRef;
+struct AVBufferRef;
 class Image;