Default in Ubuntu cargo build --target x86_64-unknown-linux-musl will failed to compile openssl-sys: error: failed to run custom build command for `openssl-sys v0.9.54` --- 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 `O