First

.gitignore

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+# CMake build directory
+/build/
+/CMakeFiles/
+
+# macOS specific
+.DS_Store
+.idea/
+
+cmake_install.cmake
+CMakeCache.txt
+Makefile
+
+.qt/
+
+# VS Code specific
+.vscode/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(MyQt6App LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
+
+# Укажи путь к Qt6
+set(CMAKE_PREFIX_PATH "/opt/homebrew/opt/qt")
+
+find_package(Qt6 REQUIRED COMPONENTS Widgets)
+
+add_executable(MyQt6App
+    main.cpp
+    MyWindow.cpp
+    MyWindow.h
+)
+
+target_link_libraries(MyQt6App Qt6::Widgets)

MyWindow.cpp

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+#include "MyWindow.h"
+#include <QPushButton>
+
+MyWindow::MyWindow(QWidget *parent) : QMainWindow(parent) {
+    QPushButton* btn = new QPushButton("Hello Qt6!", this);
+    setCentralWidget(btn);
+}

MyWindow.h

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+#pragma once
+#include <QMainWindow>
+
+class MyWindow : public QMainWindow {
+    Q_OBJECT
+public:
+    MyWindow(QWidget *parent = nullptr);
+};

main.cpp

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+#include <QApplication>
+#include "MyWindow.h"
+
+int main(int argc, char *argv[]) {
+    QApplication app(argc, argv);
+    MyWindow window;
+    window.show();
+    return app.exec();
+}