ActiveRecordとsqlite3入れる

DNP Ubuntu 
sudo apt-get install sqlite3
sudo gem install activerecord

で

sudo gem install sqlite3-ruby
したら

Select which gem to install for your platform (x86_64-linux)
 1. sqlite3-ruby 1.2.1 (mswin32)
 2. sqlite3-ruby 1.2.1 (ruby)
 3. sqlite3-ruby 1.2.0 (mswin32)
 4. sqlite3-ruby 1.2.0 (ruby)
 5. Skip this gem
 6. Cancel installation
> 2
Building native extensions.  This could take a while...
ERROR:  While executing gem ... (Gem::Installer::ExtensionBuildError)
    ERROR: Failed to build gem native extension.

ruby extconf.rb install sqlite3-ruby
checking for sqlite3.h... no

make
make: *** No rule to make target `ruby.h', needed by `sqlite3_api_wrap.o'.  Stop.


Gem files will remain installed in /var/lib/gems/1.8/gems/sqlite3-ruby-1.2.1 for inspection.
Results logged to /var/lib/gems/1.8/gems/sqlite3-ruby-1.2.1/ext/sqlite3_api/gem_make.out

で入らん