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diff --git a/gdcm-2.0.16/Wrapping/Python/gdcmswig.i b/gdcm-2.0.16/Wrapping/Python/gdcmswig.i
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index 6a5a5c7..26c8ba5 100644
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--- a/gdcm-2.0.16/Wrapping/Python/gdcmswig.i
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+++ b/gdcm-2.0.16/Wrapping/Python/gdcmswig.i
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@@ -27,6 +27,7 @@
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 // "There is no option to suppress all SWIG warning messages."
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 #pragma SWIG nowarn=302,303,312,362,383,389,401,503,504,509,510,514,516
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 %{
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+#include <cstddef> // ptrdiff_t
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 #include "gdcmTypes.h"
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 #include "gdcmASN1.h"
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 #include "gdcmSmartPointer.h"