I am trying to learn rails3.

I tried folowing the installation guide from guides.rails.info, I installed

sudo gem install rake rack-test rack-mount erubis mail
sudo gem install tzinfo builder i18n memcache-client
sudo gem install text-format thor

And rails 3 via

sudo gem install rails --pre

Now I create a new app

rails abc

And try

rake db:create

Which fails with

Could not find gem 'sqlite3-ruby (>= 0, runtime)' in any of the sources.

So I try installing sqlite3-ruby

sudo gem install sqlite3-ruby

Which fails with

Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options.

So I install it via apt-get

sudo aptitude install libsqlite3-ruby1.8.

And still get same error on rake db:create.