cmake_minimum_required(VERSION 3.7.0) project(calculator LANGUAGES CXX) set(CMAKE_AUTOMOC ON) # SingleApplication base class set(QAPPLICATION_CLASS QApplication) add_subdirectory(../.. SingleApplication) find_package(Qt${QT_DEFAULT_MAJOR_VERSION} COMPONENTS Core REQUIRED) add_executable(${PROJECT_NAME} button.h calculator.h button.cpp calculator.cpp main.cpp ) target_link_libraries(${PROJECT_NAME} SingleApplication::SingleApplication)