[Sqlite3][Ruby on Rails] How to install sqlite3 by using gem install

[Sqlite3][Ruby on Rails] How to install sqlite3 by using gem install

Question :

sudo gem install sqlite3-ruby



Building native extensions.  This could take a while...

ERROR:  Error installing sqlite3-ruby:

    ERROR: Failed to build gem native extension.



        /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/sqlite3-1.3.9 for inspection.

Results logged to /usr/lib/ruby/gems/1.8/gems/sqlite3-1.3.9/ext/sqlite3/gem_make.out



Solution :



sudo apt-get install ruby-dev



Reference:

• 
  `require': no such file to load — mkmf (LoadError)