“Unable to require openssl, install OpenSSL and rebuild ruby (preferred) or use non-HTTPS sources”
以上错误，以下解决
rvm reinstall 2.4.0 --with-openssl-dir=/usr/local/opt/openssl
错误：[!] You need at least git version 1.8.5 to use CocoaPods (Pod::Informative)
可能是连接不到xcode 修改链接命令：
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer
