Source: https://bitbucket.org/heldercorreia/speedcrunch/pull-requests/140

From a52be1f46d86d2af8cf44633f06137d976556fe8 Mon Sep 17 00:00:00 2001
From: Ronald Wright <logiconcepts819@gmail.com>
Date: Sat, 7 Jun 2025 18:33:09 -0500
Subject: [PATCH] Fix additional Qt6 build errors

---
 src/math/rational.h           | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/math/rational.h b/src/math/rational.h
index dfda4438..bbef00a3 100644
--- a/src/math/rational.h
+++ b/src/math/rational.h
@@ -19,6 +19,8 @@
 #ifndef RATIONAL_H
 #define RATIONAL_H
 
+#include <QHash>
+
 class HNumber;
 class QString;
 
@@ -64,6 +66,10 @@ public:
     QString toString() const;
     HNumber toHNumber( )const;
     double toDouble() const;
+
+    friend size_t qHash(const Rational &r, size_t seed = 0) {
+        return qHashMulti(seed, r.m_num, r.m_denom, r.m_valid);
+    }
 };
 
 #endif // RATIONAL_H
-- 
2.51.0