Gem files will remain installed in /Users/xueqingli/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/gems/2.0.0/gems/pg-0.16.0 for inspection. Results logged to /Users/xueqingli/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/gems/2.0.0/gems/pg-0.16.0/ext/gem_make.out
An error occurred while installing pg (0.16.0), and Bundler cannot continue.
Make sure that gem install pg -v '0.16.0'
succeeds before bundling.