#13 3.446 error: failed to run custom build command for `openssl-sys v0.9.97`
...
#13 3.446   Could not find directory of OpenSSL installation, and this `-sys` crate cannot
#13 3.446   proceed without this knowledge. If OpenSSL is installed and this crate had
#13 3.446   trouble finding it,  you can set the `OPENSSL_DIR` environment variable for the
#13 3.446   compilation process.
...
#13 3.450   error: could not find system library 'openssl' required by the 'openssl-sys' crate
#13 3.450   --- stderr
#13 3.450   Package openssl was not found in the pkg-config search path.
#13 3.450   Perhaps you should add the directory containing `openssl.pc'
#13 3.450   to the PKG_CONFIG_PATH environment variable
#13 3.450   No package 'openssl' found

#13 3.446 error: failed to run custom build command for `openssl-sys v0.9.97`
...
#13 3.446   Could not find directory of OpenSSL installation, and this `-sys` crate cannot
#13 3.446   proceed without this knowledge. If OpenSSL is installed and this crate had
#13 3.446   trouble finding it,  you can set the `OPENSSL_DIR` environment variable for the
#13 3.446   compilation process.
...
#13 3.450   error: could not find system library 'openssl' required by the 'openssl-sys' crate
#13 3.450   --- stderr
#13 3.450   Package openssl was not found in the pkg-config search path.
#13 3.450   Perhaps you should add the directory containing `openssl.pc'
#13 3.450   to the PKG_CONFIG_PATH environment variable
#13 3.450   No package 'openssl' found