--- thumbnail/exrcreator.cpp.orig	2021-02-24 23:05:55 UTC
+++ thumbnail/exrcreator.cpp
@@ -25,6 +25,7 @@
 
 #include <ImfInputFile.h>
 #include <ImfPreviewImage.h>
+#include <ImfHeader.h>
 
 #include <ksharedconfig.h>
 #include <kconfiggroup.h>