--- a/avmedia/Library_avmedia.mk	
+++ a/avmedia/Library_avmedia.mk	
@@ -36,6 +36,7 @@ $(eval $(call gb_Library_set_include,avmedia,\
 	$$(INCLUDE) \
 	-I$(SRCDIR)/avmedia/inc \
 	-I$(SRCDIR)/avmedia/source/inc \
+	-I$(SRCDIR)/sfx2/inc \
 ))
 
 $(eval $(call gb_Library_use_sdk_api,avmedia,))