https://bugs.gentoo.org/905387
https://github.com/Kitware/VTK/commit/4d8283bcb460ff60d8df1b7b67b5db19876a5ca3

From 890f7574f01cf58cb1522772a62ca07deb438479 Mon Sep 17 00:00:00 2001
From: Mathieu Westphal <mathieu.westphal@kitware.com>
Date: Thu, 23 Feb 2023 18:06:07 +0100
Subject: [PATCH 1580/2105] More #include <cstdint> to compile with gcc13

--- a/IO/PIO/PIOData.h
+++ b/IO/PIO/PIOData.h
@@ -1,6 +1,7 @@
 #if !defined(_PIODATA_H)
 #define _PIODATA_H
 
+#include <cstdint>
 #include <fstream>
 #include <iostream>
 #include <list>
--- a/Rendering/Matplotlib/vtkMatplotlibMathTextUtilities.h
+++ b/Rendering/Matplotlib/vtkMatplotlibMathTextUtilities.h
@@ -49,7 +49,8 @@
 #include "vtkMathTextUtilities.h"
 #include "vtkRenderingMatplotlibModule.h" // For export macro
 
-#include <vector> // for std::vector
+#include <cstdint> // for std::uint64_t
+#include <vector>  // for std::vector
 
 struct _object;
 typedef struct _object PyObject;
-- 
2.40.1