sudo gem install pg won't work

Question

I\'m trying to get Rails to work with PostgreSQL. Apparently one thing I need to do along the way is sudo gem install pg. When I do that, I get this:

Answer 1

You need to install your distro ruby-dev (or devel) package otherwise you won~t be able to build any ruby C extensions.

I'm not on ubuntu, but you package-manager command might be somewhat like this:

$ sudo apt-get install ruby-dev build-essential