The following variables are used in this project, but they are set to NOTFOUND.

报错信息"The following variables are used in this project, but they are set to NOTFOUND."表示在项目中使用了一些变量，但这些变量的值被设置为NOTFOUND。这意味着这些变量没有找到相应的值，可能是因为未正确设置或者未正确测试。

解决此问题的方法有以下几种：
1. 检查CMake文件中的变量设置：确认变量的名称是否正确以及它们是否被正确设置为有效的值。检查相关的CMakeLists.txt文件或者其他配置文件，确保所有变量都被正确设置和测试。

2. 检查依赖库的路径：如果报错中提到了缺失的变量与某个依赖库相关，可以尝试手动设置相应的依赖库路径。确保所需的库文件存在，并且路径被正确设置。

3. 重新运行CMake：如果以上方法都没有解决问题，可以尝试重新运行CMake，并指定不同的源目录。这样做可能会重新加载和解析源文件，修复可能存在的配置错误。

以上是解决报错"The following variables are used in this project, but they are set to NOTFOUND."的几种方法。根据具体情况选择适合的解决方案进行排查和修复。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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