cargo编译musl报错openssl

背景

生产环境和编译环境的glibc版本不同出现来如下报错

/lib64/libc.so.6: version `GLIBC_x.xx' not found

所以需要使用cargo 跨平台编译x86_64-unknown-linux-musl，而后就报出来openssl相关的错误：

--- stderr

thread 'main' panicked at '

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 infor