--- src/qwt3d_function.cpp.orig	2011-06-11 11:12:47.519706337 +0200
+++ src/qwt3d_function.cpp	2011-06-11 11:13:17.543178547 +0200
@@ -1,5 +1,6 @@
 #include "qwt3d_surfaceplot.h"
 #include "qwt3d_function.h"
+#include <cstdio>
 
 using namespace Qwt3D;
 

.