title: Error Installing Jekyll in Cygwin
body: <p>So I attempted to install Jekyll on Windows through Cygwin and I encountered an error when I tried to install Jekyll through Cygwin. Here is the output.</p>
  
  <pre><code>Michael@X556UAK: ~$ gem install jekyll
  Building native extensions.  This could take a while...
  ERROR:  Error installing jekyll:
      ERROR: Failed to build gem native extension.
  
  current directory: /c/Users/Michael/.gem/ruby/2.3.0/gems/ffi-1.9.18/ext/ffi_c
  /usr/bin/ruby.exe -r ./siteconf20171011-7692-lgoixq.rb extconf.rb
  mkmf.rb can't find header files for ruby at /usr/share/ruby/include/ruby.h
  
  extconf failed, exit code 1
  
  Gem files will remain installed in /c/Users/Michael/.gem/ruby/2.3.0/gems/ffi-   1.9.18 for inspection.
  Results logged to /c/Users/Michael/.gem/ruby/2.3.0/extensions/x86_64-cygwin/2.3.0/ffi-1.9.18/gem_make.out
  </code></pre>
  
  <p>I conducted some research online and I wasn't able to find a solution. I tried running Cygwin as an administrator and I still got that error message. </p>
  
  <p>What can I do to fix this issue?</p>