问题

在 Windows 下构建时抛出了下方错误，意思就是缺少 OpenSSL 这个玩意儿，如果在 Linux 平台直接用包管理工具安装就 OK 了，但是在 Windows 平台则需要手动操作。

  OPENSSL_DIR unset
  note: vcpkg did not find openssl: Could not look up details of packages in vcpkg tree could not read status file updates dir: 系统找不到指定的路径。 (os error 3)

  --- stderr

  thread 'main' panicked at C:\Users\mark\.cargo\registry\src\index.crates.io-6f17d22bba15001f\openssl-sys-0.9.103\build\find_normal.rs:190:5:

  Could not find directory of OpenSSL installation, and this `-sys` crate cannot

  proceed without this knowledge. If OpenSSL is installed and this crate had

  trouble finding it,  you can set the `OPENSSL_DIR` environment variable for the

  compilation process.

  Make sure you also have the development packages of openssl installed.

  For example, `libssl-dev` on Ubuntu or `openssl-devel` on Fedora.

  If you're in a situation where you think the directory *should* be found

  automatically, please open a bug at https://github.com/sfackler/rust-openssl

  and include information about your system as well as this message.

  $HOST = aarch64-pc-windows-msvc
  $TARGET = aarch64-pc-windows-msvc
  openssl-sys = 0.9.103


  It looks like you're compiling for MSVC but we couldn't detect an OpenSSL

  installation. If there isn't one installed then you can try the rust-openssl

  README for more information about how to download precompiled binaries of

  OpenSSL:
  https://github.com/sfackler/rust-openssl#windows

解决方法

使用的 choco 安装，如果没有 choco 见 这篇文章 快速安装。

choco install openssl

安装完之后，还需要设置环境变量

OPENSSL_DIR： C:\Program Files\OpenSSL-Win64
OPENSSL_LIB_DIR：C:\Program Files\OpenSSL-Win64\lib\VC\x64\MD

最后，重启 VSCode 再构建就行了。

引用

• https://juejin.cn/post/6994715287178182693
• https://docs.rs/openssl/0.10.36/openssl/#manual