Can't install pg gem on Mountain Lion

Question

I have been having a lot of troubles with Rails after upgrading to Mountain Lion.

Trying to trouble shoot these and searching for hours on the internet so far I have

Answer 1

Alternatively, use the Postgres app. IMO, it's the easiest and fastest way to get up and running with PostgreSQL and Rails on Mac.

For detailed instructions: http://blog.parsalabs.com/blog/2013/09/14/installing-postgresql-don-mac-os-x-and-using-it-as-your-rails-apps-database/