Index: src/libkst/editablematrix.cpp
--- src/libkst/editablematrix.cpp.orig
+++ src/libkst/editablematrix.cpp
@@ -19,6 +19,7 @@
 #include "debug.h"
 #include <qbytearray.h>
 #include <QXmlStreamWriter>
+#include <QDataStream>
 
 namespace Kst {
 
