title: Can't install RMagick 2.13.1. Can't find Magick-config
body: <pre><code>$ gem install rmagick
  Building native extensions.  This could take a while...
  ERROR:  Error installing rmagick:
      ERROR: Failed to build gem native extension.
  
          /Users/XXXXXXX/.rvm/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb
  checking for Ruby version &gt;= 1.8.5... yes
  checking for gcc... yes
  checking for Magick-config... no
  Can't install RMagick 2.13.1. Can't find Magick-config in /Users/XXXXXXX/.rvm/gems/ruby-1.9.2-p180/bin:/Users/XXXXXXX/.rvm/gems/ruby-1.9.2-p180@global/bin:/Users/XXXXXXX/.rvm/rubies/ruby-1.9.2-p180/bin:/Users/XXXXXXX/.rvm/bin:/Users/XXXXXXX/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
      --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=/Users/XXXXXXX/.rvm/rubies/ruby-1.9.2-p180/bin/ruby
  
  
  Gem files will remain installed in /Users/XXXXXXX/.rvm/gems/ruby-1.9.2-p180/gems/rmagick-2.13.1 for inspection.
  Results logged to /Users/XXXXXXX/.rvm/gems/ruby-1.9.2-p180/gems/rmagick-2.13.1/ext/RMagick/gem_make.out
  </code></pre>
  
  <p>But when I do this:</p>
  
  <pre><code>$ locate Magick-config
  /opt/local/bin/Magick-config
  /opt/local/share/man/man1/Magick-config.1.gz
  /opt/local/var/macports/software/ImageMagick/6.6.4-9_0+q16/opt/local/bin/Magick-config
  /opt/local/var/macports/software/ImageMagick/6.6.4-9_0+q16/opt/local/share/man/man1/Magick-config.1.gz
  /opt/local/var/macports/software/ImageMagick/6.6.5-0_0+q16/opt/local/bin/Magick-config
  /opt/local/var/macports/software/ImageMagick/6.6.5-0_0+q16/opt/local/share/man/man1/Magick-config.1.gz
  </code></pre>
  
  <p>Any ideas?</p>