--- src/enginefilterblock.cpp.orig	2008-05-22 09:27:10.000000000 -0700
+++ src/enginefilterblock.cpp	2008-05-22 09:27:16.000000000 -0700
@@ -21,6 +21,7 @@
 #include "enginefilteriir.h"
 #include "enginefilter.h"
 #include "enginefilterbutterworth8.h"
+#include <QtDebug>
 
 EngineFilterBlock::EngineFilterBlock(const char * group)
 {