gem error

mac os

$ rvm osx-ssl-certs update

• Get the CURL Certificate Authority (CA) bundle. You can do this with:

$ sudo port install curl-ca-bundle [if you are using MacPorts]

• Execute the ruby code that is trying to verify the SSL certification:

$ SSL_CERT_FILE=/opt/local/etc/certs/cacert.pem

• gem 安装没有问题，但 bundle 安装报错，可以尝试更新 bundle

gem install bundle

Windows

$ gem install compass
// SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

• 下载 http://curl.haxx.se/ca/cacert.pem 文件到本地，路径为 C:Ruby23-x64cacert.pem
• 新建系统环境变量 SSL_CERT_FILE ， 值为 C:Ruby23-x64cacert.pem
• 重新打开命令行工具

参考

• stackoverflow - certificate verify failed
• OpenSSL Errors and Rails – Certificate Verify Failed
• stackoverflow - certificate-verify-failed-on-windows