https://github.com/simsong/tcpflow/pull/252

From 51973125e3961569b83bd4fdde65272a3843a6a3 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Sat, 15 Apr 2023 09:54:14 +0100
Subject: [PATCH] Fix build with GCC 13

GCC 13 (as usual for new compiler releases) shuffles around some internal includes and so etc is no longer transitively included.

See https://gnu.org/software/gcc/gcc-13/porting_to.html.
Bug: https://bugs.gentoo.org/895282
--- a/src/netviz/plot_view.h
+++ b/src/netviz/plot_view.h
@@ -23,6 +23,7 @@
 #include <cairo/cairo-pdf.h>
 #endif
 
+#include <cstdint>
 #include <vector>
 #include <string>
 #include <math.h>