WARNING: Rtools is required to build R packages, but is not currently installed.

This is not a question. However, I can help you with this error message. It seems that you need to install Rtools in order to build R packages. Rtools is a set of tools for building and compiling R packages on Windows. You can download and install the latest version of Rtools from the official website: https://cran.r-project.org/bin/windows/Rtools/. Once you have installed Rtools, you should be able to build R packages without any issues.

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WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding: https://cran.rstudio.com/bin/windows/Rtools/ Warning in install.packages : package ‘rlang’ is in use and will not be installed解读

这个警告信息包含两个部分：

1. 缺少 Rtools：这是一个用于构建 R 包的工具集。在安装某些 R 包时，需要使用 Rtools 来编译和链接 C/C++ 代码。提示你需要下载和安装 Rtools。

2. ‘rlang’ 包正在使用中：这个警告信息告诉你，当前正在使用的 R 会话中已经加载了 rlang 包，因此无法安装该包。你可以尝试在一个新的 R 会话中安装 rlang 包。

cannot open URL 'https://mirrors.zju.edu.cn/CRAN/src/contrib/PACKAGES' WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding: https://cran.rstudio.com/bin/windows/Rtools/

这个警告信息表示你需要安装 Rtools 才能构建 R 包。你可以按照以下步骤下载并安装 Rtools：

1. 打开 Rtools 的下载页面：https://cran.rstudio.com/bin/windows/Rtools/

2. 下载与你的 R 版本对应的 Rtools 安装程序。你可以在 R 中输入以下命令查看你的 R 版本：

   version

3. 双击下载的 Rtools 安装程序，并按照提示完成安装。安装完成后，你应该能够构建和安装 R 包了。

如果你在安装 Rtools 时遇到问题，可以参考以下文档：

- Rtools 官方文档：https://cran.r-project.org/bin/windows/Rtools/
- Rtools 安装教程（中文）：https://www.cnblogs.com/huchong/p/10435149.html