mac安装rails问题

gem install mysql2
brew install mysql 
gem install mysql2
http://stackoverflow.com/questions/12811489/installing-mysql2-gem-rails-on-mac
 

gem install pg

  1. Make sure you have Xcode installed first.
  2. Run: brew install postgresql
  3. Add to your GemFile: gem 'pg'
  4. Run: bundle install
http://stackoverflow.com/questions/18196054/gem-install-pg-on-mac-10-7-5
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原文地址：https://www.cnblogs.com/qinyan20/p/3643267.html