title: Gem install error with RMagick
body: <p>In the past I used RMagick and also had Imagemagick, and recently I bundle installed a newer version of RMagick. </p>
  
  <p>When restarting my rails server I got errors. So I decided to uninstall first imagemagick (from brew) and then uninstall rmagick. </p>
  
  <p>I tried re-installing rmagick and I am some trouble (first one being I can't install from the bundle command). I tried <code>gem install rmagick -v '2.13.1'</code> but I get the following permission error:</p>
  
  <pre><code>ERROR:  While executing gem ... (Errno::EACCES)
  Permission denied - /Users/username/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper
  </code></pre>
  
  <p>I also tried with the <code>sudo</code> and got </p>
  
  <pre><code>ERROR:  While executing gem ... (Errno::EACCES)
  Permission denied - /Users/username/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper
  usercomputer:~ Username$ sudo gem install rmagick -v '2.13.1'
  Building native extensions.  This could take a while...
  ERROR:  Error installing rmagick:
      ERROR: Failed to build gem native extension.
  
      /Users/username/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
  checking for Ruby version &gt;= 1.8.5... yes
  extconf.rb:128: Use RbConfig instead of obsolete and deprecated Config.
  checking for /usr/bin/gcc-4.2... yes
  checking for Magick-config... no
  Can't install RMagick 2.13.1. Can't find Magick-config in /Users/username/.rvm/gems/ruby-1.9.3-p194/bin:/Users/Aurelien/.rvm/gems/ruby-1.9.3-p194@global/bin:/Users/username/.rvm/rubies/ruby-1.9.3-p194/bin:/Applications/MAMP/bin/php5/bin:/Applications/MAMP/htdocs/cake/cake/cake/console:/Users/username/.rvm/gems/ruby-1.9.3-p194/bin:/Users/username/.rvm/gems/ruby-1.9.3-p194@global/bin:/Users/username/.rvm/rubies/ruby-1.9.3-p194/bin:/Users/username/.rvm/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/git/bin:/usr/X11/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
  --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=/Users/username/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
  
  
  Gem files will remain installed in /Users/username/.rvm/gems/ruby-1.9.3-p194/gems/rmagick-2.13.1 for inspection.
  Results logged to /Users/username/.rvm/gems/ruby-1.9.3-p194/gems/rmagick-2.13.1/ext/RMagick/gem_make.out
  </code></pre>
  
  <p>Surely I have done something wrong along the way, but I am not sure what?</p>
  
  <p>Thank you for you answers.</p>