WARNING: Rtools is required to build R packages, but is not currently installed. Please download and install Rtools 4.2 from https://cran.r-project.org/bin/windows/Rtools/ or https://www.r-project.org/nosvn/winutf8/ucrt3/. 错误: Failed to install 'unknown package' from GitHub: HTTP error 404. Not Found Did you spell the repo owner (`wyguo`) and repo name (`CIRI2`) correctly? - If spelling is correct, check that you have the required permissions to access the repo.

这个错误提示表示你需要安装 Rtools 才能构建 R 包并成功安装 CIRI2 包。Rtools 是一个用于 Windows 系统的工具集，包含了一些编译和构建 R 软件包所需的工具。

你可以按照以下步骤下载和安装 Rtools：

1. 访问 Rtools 官方网站：https://cran.r-project.org/bin/windows/Rtools/ 。

2. 找到与你当前使用的 R 版本相对应的 Rtools 版本，并下载安装程序。

3. 运行安装程序，按照提示完成安装。

安装完成后，你可以重新尝试安装 CIRI2 包。如果你仍然遇到问题，可以检查你的网络连接是否正常，并确保你输入的命令没有拼写错误。另外，你也可以尝试联系 CIRI2 包的开发者以获取更多帮助。

相关问题

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

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.