cmake中如何将前缀路径添加到CMAKE_PREFIX_PATH

Question

linux下，导入qt项目
执行cmakelist.txt时如下语句报错

find_package(Qt5Widgets REQUIRED) 

报错信息如下：

Could not find a package configuration file provided by "Qt5Widgets" with
  any of the following names:

    Qt5WidgetsConfig.cmake
    qt5widgets-config.cmake

  Add the installation prefix of "Qt5Widgets" to CMAKE_PREFIX_PATH or set
  "Qt5Widgets_DIR" to a directory containing one of the above files.  If
  "Qt5Widgets" provides a separate development package or SDK, be sure it has
  been installed.

意思就是要添加qt5widgets的安装路径的前缀到CMAKE_PREFIX_PATH罗？但是我不知道要怎么将qt5widgets的安装路径添加到cmake_prefix_path呀。我在电脑上找到qt5widgets了，求dalao指点该怎么配置CMAKE_PREFIX_PATH，或者其他解决方案也当然感激不尽

Answer 1

编译时加上 -DCMAKE_PREFIX_PATH=path/to/qt5widgets 试一试