title: An error occurred while installing rmagick (2.16.0) [I tried all option provided in Duplicate but same issue persisit]
body: <p><strong>I 'm on Ubuntu 16.04</strong> ,
  in gemfile I have <code>gem "rmagick"</code> and when I <code>bundle</code> it says </p>
  
  <pre><code>An error occurred while installing rmagick (2.16.0), and Bundler cannot
  continue.
  Make sure that `gem install rmagick -v '2.16.0'` succeeds before bundling.
  </code></pre>
  
  <p>as suggested above when I try <code>gem install rmagick -v '2.16.0'</code> it says</p>
  
  <pre><code>Building native extensions.  This could take a while...
  ERROR:  Error installing rmagick:
      ERROR: Failed to build gem native extension.
  
      current directory: /home/faisal/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rmagick-2.16.0/ext/RMagick
  /home/faisal/.rbenv/versions/2.3.1/bin/ruby -r ./siteconf20160926-26223-16sn0dg.rb extconf.rb
  checking for gcc... yes
  checking for Magick-config... no
  checking for pkg-config... yes
  Package MagickCore was not found in the pkg-config search path.
  Perhaps you should add the directory containing `MagickCore.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'MagickCore' found
  checking for outdated ImageMagick version (&lt;= 6.4.9)... *** 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/faisal/.rbenv/versions/2.3.1/bin/$(RUBY_BASE_NAME)
  
  To see why this extension failed to compile, please check the mkmf.log which can be found here:
  
    /home/faisal/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/extensions/x86_64-linux/2.3.0-static/rmagick-2.16.0/mkmf.log
  
  extconf failed, exit code 1
  
  Gem files will remain installed in /home/faisal/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rmagick-2.16.0 for inspection.
  Results logged to /home/faisal/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/extensions/x86_64-linux/2.3.0-static/rmagick-2.16.0/gem_make.out
  </code></pre>
  
  <p>I have tried dozen of different ways provided in different questions but none of the work.</p>