title: Is there an easy way to install RMagick?
body: <p>I am trying to install RMagick on my slicehost(Linux Hardy)
  instead of compile from source, here is what I did:</p>
  
  <pre><code>$ sudo aptitude install -y imagemagick
  $ sudo aptitude install -y libmagick9-dev
  $ sudo gem install rmagick
  </code></pre>
  
  <p>After installed, it reads GIF with no problem, however for JPEG and PNG, I keep getting this error:</p>
  
  <pre><code>Magick::ImageMagickError: no decode delegate for this image format 
  </code></pre>
  
  <p>I know it is probably because I don't have libpng and libjpg libraries, but i didn't find guide on how to install these. I compiled libpng and libjpg from source, with no luck, the files are in the /usr/lib, but i still getting the error.</p>