• Qt5.14.2
• mingw7.3 x64
• Clion 2020.1

1. Edit CMake

    cmake_minimum_required(VERSION 3.10)
    project(ClionQt)
   
    set(CMAKE_CXX_STANDARD 17)
    set(CMAKE_INCLUDE_CURRENT_DIR ON)
    set(CMAKE_PREFIX_PATH "C:\\Qt\\Qt5.14.2\\5.14.2\\mingw73_64")
   
    find_package(Qt5Widgets REQUIRED)
   
    set(CMAKE_AUTOMOC ON)
    set(CMAKE_AUTOUIC ON)
    set(CMAKE_AUTORCC ON)
   
    add_executable(ClionQt main.cpp)
    target_link_libraries(ClionQt Qt5::Widgets)
   

2. Copy "Qt5Core.dll", "Qt5Gui.dll", and "Qt5Widgets.dll" into cmake-build-debug directory

3. In "CMake" --> "CMake options", add\

     "-DCMAKE_PREFIX_PATH=C:\Qt\Qt5.14.2\5.14.2\mingw73_64\"
   

4. In "Edit Run/Debug configurations" --> "Environment Variables", add\

    "QT_QPA_PLATFORM_PLUGIN_PATH=C:\Qt\Qt5.14.2\5.14.2\mingw73_64\plugins\platforms"
   

https://www.jetbrains.com/help/clion/qt-tutorial.html