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diff --git a/3rdparty/qwtplot3d/src/qwt3d_function.cpp b/3rdparty/qwtplot3d/src/qwt3d_function.cpp
index 3271aea..559127b 100755
--- a/3rdparty/qwtplot3d/src/qwt3d_function.cpp
+++ b/3rdparty/qwtplot3d/src/qwt3d_function.cpp
@@ -1,3 +1,4 @@
+#include <cstdio>
 #include "qwt3d_surfaceplot.h"
 #include "qwt3d_function.h"