Rail Server for Project を起動すると、次のようなエラーが表示されます
sahil@sahil-M:~/sites/tasks$ rails s
Could not find gem 'sqlite3 (>= 0, runtime)' in any of the gem sources listed in your Gemfile.
Run `bundle install` to install missing gems.
バンドルのインストールに行くと、別のエラーが発生します
sahil@sahil-M:~/sites/tasks$ sudo bundle install
Fetching source index for http://rubygems.org/
Using rake (0.9.2)
Using abstract (1.0.0)
Using activesupport (3.0.8)
Using builder (2.1.2)
Using i18n (0.5.0)
Using activemodel (3.0.8)
Using erubis (2.6.6)
Using rack (1.2.3)
Using rack-mount (0.6.14)
Using rack-test (0.5.7)
Installing tzinfo (0.3.28)
Using actionpack (3.0.8)
Using mime-types (1.16)
Using polyglot (0.3.1)
Using treetop (1.4.9)
Using mail (2.2.19)
Using actionmailer (3.0.8)
Using arel (2.0.10)
Using activerecord (3.0.8)
Using activeresource (3.0.8)
Using bundler (1.0.15)
Using thor (0.14.6)
Using railties (3.0.8)
Using rails (3.0.8)
Installing sqlite3 (1.3.3) with native extensions /usr/local/lib/site_ruby/1.8/rubygems/installer.rb:483:in `build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)
/usr/bin/ruby1.8 extconf.rb
extconf.rb:3:in `require': no such file to load -- mkmf (LoadError)
from extconf.rb:3
Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/sqlite3-1.3.3 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/sqlite3-1.3.3/ext/sqlite3/gem_make.out
from /usr/local/lib/site_ruby/1.8/rubygems/installer.rb:446:in `each'
from /usr/local/lib/site_ruby/1.8/rubygems/installer.rb:446:in `build_extensions'
from /usr/local/lib/site_ruby/1.8/rubygems/installer.rb:198:in `install'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/source.rb:101:in `install'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/rubygems_integration.rb:78:in `preserve_paths'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/source.rb:91:in `install'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/installer.rb:58:in `run'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/rubygems_integration.rb:93:in `with_build_args'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/installer.rb:57:in `run'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12:in `each'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12:in `each'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/installer.rb:49:in `run'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/installer.rb:8:in `install'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/cli.rb:222:in `install'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/task.rb:22:in `send'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/task.rb:22:in `run'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor.rb:246:in `dispatch'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/lib/bundler/vendor/thor/base.rb:389:in `start'
from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.15/bin/bundle:13
from /usr/bin/bundle:19:in `load'
from /usr/bin/bundle:19