Source: https://bitbucket.org/heldercorreia/speedcrunch/pull-requests/127

From 579fe071c6229f2d26571b4cbc88afc46ad20943 Mon Sep 17 00:00:00 2001
From: Oktay Imanzade <imanov.computer@gmail.com>
Date: Mon, 18 Mar 2024 17:08:15 +0000
Subject: [PATCH] Fix keypad for Qt6

---
 src/gui/keypad.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gui/keypad.cpp b/src/gui/keypad.cpp
index d206c76c..b252c85d 100644
--- a/src/gui/keypad.cpp
+++ b/src/gui/keypad.cpp
@@ -82,7 +82,11 @@ Keypad::Keypad(QWidget* parent)
     setButtonTooltips();
     disableButtonFocus();
     setLayoutDirection(Qt::LeftToRight);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    connect(&mapper, SIGNAL(mappedInt(int)), SLOT(emitButtonPressed(int)));
+#else
     connect(&mapper, SIGNAL(mapped(int)), SLOT(emitButtonPressed(int)));
+#endif
 }
 
 void Keypad::handleRadixCharacterChange()
-- 
2.51.0