[Rails] Could not install Rmagick Gem in rails 4 (Ubuntu 13.04)

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

     /home/anil/.rvm/rubies/ruby-2.0.0-p481/bin/ruby extconf.rb
checking for Ruby version >= 1.8.5... yes
checking for gcc... yes
checking for Magick-config... no
Can't install RMagick 2.13.2. Can't find Magick-config in
/usr/local/heroku/bin:/home/anil/.rvm/gems/ruby-2.0.0-p481/bin:/home/anil/.rvm/gems/ruby-2.0.0-p481@global/bin:/home/anil/.rvm/rubies/ruby-2.0.0-p481/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/anil/.rvm/bin:/home/anil/.rvm/bin:/home/anil/.rvm/bin

*** extconf.rb failed ***
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.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/home/anil/.rvm/rubies/ruby-2.0.0-p481/bin/ruby

extconf failed, exit code 1

Gem files will remain installed in
/home/anil/.rvm/gems/ruby-2.0.0-p481/gems/rmagick-2.13.2 for inspection.
Results logged to
/home/anil/.rvm/gems/ruby-2.0.0-p481/extensions/x86-linux/2.0.0/rmagick-2.13.2/gem_make.out
An error occurred while installing rmagick (2.13.2), and Bundler cannot
continue.
Make sure that `gem install rmagick -v '2.13.2'` succeeds before bundling.