windows下，用CMake编译qt项目，出现错误By not providing “FindQt5.cmake“...

开发环境：windows10 + qt5.14， 编译器msvc2017x64，CMake3.30；

现象：

CMakeList文件里，如有find_package(Qt5 COMPONENTS Widgets REQUIRED)

target_link_libraries(dis_lib PRIVATE Qt5::Widgets)

用CMake生成工程时候，会有如下错误：

CMake Error at CMakeLists.txt:69 (find_package):
By not providing "FindQt5.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "Qt5", but
CMake did not find one.

Could not find a package configuration file provided by "Qt5" with any of
the following names:

Qt5Config.cmake
qt5-config.cmake

Add the installation prefix of "Qt5" to CMAKE_PREFIX_PATH or set "Qt5_DIR"
to a directory containing one of the above files. If "Qt5" provides a
separate development package or SDK, be sure it has been installed.

解决方法：

1.在qt安装目录搜索Qt5Config.cmake，找到文件路径；

2.在系统环境变量-用户变量里，添加Qt5_DIR=文件路径；如下图，然后保存

3.重新CMake即可；

以上；

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