Rails 3 can not find sqlite3-ruby

Question

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 .

Answer 1

This can be caused by a number of things. So I have a number of questions too. ;)

Is this Debian or Ubuntu? I'm going to assume Ubuntu.

I also assume, because you tried installing libsqlite3-ruby1.8 , that you are also running Ruby 1.8? Do you have any other versions of Ruby installed? And what does ruby --version say?

Ubuntu versions it's Ruby packages as ruby1.8 , ruby1.9.0 , and ruby1.9.1 . Look for those in your package manager. The package named just ruby is a dummy that depends on whatever is the default version for Ubuntu at that time.

When you start irb and do require 'sqlite3' , what is the output?

As for the gem install not working, if you want to try that again, do you have the ruby-dev and libsqlite3-dev Ubuntu packages installed?

Answer 2

Having played this lottery the thing I found that has worked for me after many different variations complaining about missing sqlite3 libraries:

sudo apt-get install libsqlite3-0 libsqlite3-dev
sudo gem install sqlite3-ruby