problem in install passenger..

I want to install passenger but i am getting following error..
I have already installed :

sudo apt-get install ruby1.8-dev

sudo gem install passenger
Building native extensions. This could take a while...
ERROR: Error installing passenger:
  ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
creating Makefile

sh: make: not found

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/
fastthread-1.0.7 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/fastthread-1.0.7/ext/

Did you install the build-essentials?

sudo apt-get install build-essential

Best regards

Peter De Berdt