title: Installation of Wand fails because of imagemagick linking error
body: <p>I want to use the python package wand and installed it with </p>
  
  <pre><code>pip install Wand
  </code></pre>
  
  <p>but when I run the script I get the error</p>
  
  <p>ImportError: MagickWand shared library not found.
  You probably had not installed ImageMagick library.
  Try to install:
    brew install freetype imagemagick</p>
  
  <p>so I followed the instruction</p>
  
  <pre><code>$ brew install freetype imagemagick
  Warning: freetype 2.8.1 is already installed
  Warning: imagemagick 7.0.7-10 is already installed, it's just not linked.
  You can use `brew link imagemagick` to link this version.
  </code></pre>
  
  <p>and again followed the instruction </p>
  
  <pre><code>$ brew link imagemagick
  Linking /usr/local/Cellar/imagemagick/7.0.7-10... 
  Error: Could not symlink etc/ImageMagick-7/coder.xml
  /usr/local/etc/ImageMagick-7 is not writable.
  </code></pre>
  
  <p>does anybody know what this is about? I have never seen such an issue and google does seem to show any useful results...</p>
  
  <p>EDIT: Here is what I get when I try to remove the package and reinstall</p>
  
  <pre><code>$ brew install ImageMagick --with-freetype  
  Warning: imagemagick: this formula has no --with-freetype option so it will be ignored!
  ==&gt; Downloading https://homebrew.bintray.com/bottles/imagemagick-7.0.7-10.high_sierra.bottle.tar.gz
  Already downloaded: /Users/xflorian/Library/Caches/Homebrew/imagemagick-7.0.7-10.high_sierra.bottle.tar.gz
  ==&gt; Pouring imagemagick-7.0.7-10.high_sierra.bottle.tar.gz
  Error: The `brew link` step did not complete successfully
  The formula built, but is not symlinked into /usr/local
  Could not symlink etc/ImageMagick-7/coder.xml
  /usr/local/etc/ImageMagick-7 is not writable.
  
  You can try again using:
    brew link imagemagick
  ==&gt; Summary
    /usr/local/Cellar/imagemagick/7.0.7-10: 1,523 files, 23.1MB
  
  $ brew link imagemagick
  Linking /usr/local/Cellar/imagemagick/7.0.7-10... 
  Error: Could not symlink etc/ImageMagick-7/coder.xml
  /usr/local/etc/ImageMagick-7 is not writable. 
  </code></pre>