Bug:

    1. run pkg_config fail: "Failed to run `\"pkg-config\" \"--libs\" \"--cflags\" \"openssl\"`: No such file or directory (os error 2)"
    3. --- stderr
    4. thread 'main' panicked at '
    6. Could not find directory of OpenSSL installation, and this `-sys` crate cannot
    7. proceed without this knowledge. If OpenSSL is installed and this crate had
    8. trouble finding it,  you can set the `OPENSSL_DIR` environment variable for the
    9. compilation process.
    11. Make sure you also have the development packages of openssl installed.
    12. For example, `libssl-dev` on Ubuntu or `openssl-devel` on Fedora.

    修复：

    1. apt-get install libssl-dev pkg-config