Error message: Make sure that `gem install pg -v '0.18.1'` succeeds before bundling

If you're on Ubuntu, most likely you're missing a hidden dependency

sudo apt-get install libpq-dev

If you are on OS X, try these steps

Install Xcode command line tools (Apple Developer site). If you have it already installed, update it using brew update.
brew uninstall postgresql
brew install postgresql
gem install pg

If you are an Ubuntu user you need to do the following prior installing the gem

sudo apt-get install libpq-dev

Then perform gem install pg -v '0.18.1' or just bundle install if you have you r gem in a GEMFILE.

If you are using Mac and Homebrew, Looks like libpqxx lib was missing.

brew install libpqxx

This command should do it.

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