cocoapod [!] /usr/bin/curl -f -L -o /var/folders/dj/yccslvys6tb53k2vz87djfsh0000gn/T/d20170219-12508-z77a4l/file.zip https://github.com/kylefleming/opencv/releases/download/3.1.0-ios-fix/opencv2.fram

  [!] /usr/bin/curl -f -L -o /var/folders/dj/yccslvys6tb53k2vz87djfsh0000gn/T/d20170219-12508-z77a4l/file.zip https://github.com/kylefleming/opencv/releases/download/3.1.0-ios-fix/opencv2.fram 或者 ssl证书问题

  参考网址： https://ruby.taobao.org

$ gem sources --add https://gems.ruby-china.org/ --remove https://rubygems.org/
$ gem sources -l
*** CURRENT SOURCES ***

https://gems.ruby-china.org
# 请确保只有 gems.ruby-china.org
$ gem install rails

$ bundle config mirror.https://rubygems.org https://gems.ruby-china.org

****关键：
$ sed -i .bak -E ‘s!https?://cache.ruby-lang.org/pub/ruby!https://ruby.taobao.org/mirrors/ruby!‘ $rvm_path/config/db

cocoapod [!] /usr/bin/curl -f -L -o /var/folders/dj/yccslvys6tb53k2vz87djfsh0000gn/T/d20170219-12508-z77a4l/file.zip https://github.com/kylefleming/opencv/releases/download/3.1.0-ios-fix/opencv2.fram

原文：http://www.cnblogs.com/wujie123/p/6415514.html