https://bugs.gentoo.org/898908
https://github.com/openMSX/openMSX/commit/b50d02069c09f11c687637c64ca1b459a5def28c

From b50d02069c09f11c687637c64ca1b459a5def28c Mon Sep 17 00:00:00 2001
From: m9710797 <vermaelen.wouter@gmail.com>
Date: Sat, 4 Feb 2023 16:37:39 +0100
Subject: [PATCH] Added missing #include

Thanks to 'musuruan' for reporting.
https://github.com/openMSX/openMSX/issues/1487
--- a/src/utils/hash_set.hh
+++ b/src/utils/hash_set.hh
@@ -11,6 +11,7 @@
 #include "unreachable.hh"
 #include "xrange.hh"
 #include <cassert>
+#include <cstdint>
 #include <cstdlib>
 #include <functional>
 #include <initializer_list>