title: Running 'jekyll serve' on cloud foundry
body: <p>I'd like to serve a jekyll site from a deployed app on cloud foundry using <code>bundle exec jekyll serve</code>, but I get an error when the app tries to start.</p>
  
  <p>I'm testing with a new jekyll 3.3.0 site, I have just added exclude <code>vendor</code> to the _config.yml.</p>
  
  <p>I'm trying this manifest.yml file with the standard ruby buildpack:</p>
  
  <pre><code>---
  applications:
  - name: cf-jekyll-serve
    buildpack: https://github.com/cloudfoundry/ruby-buildpack.git
    memory: 512M
    instances: 1
    path: .
    command: bundle exec jekyll serve --port $PORT
  </code></pre>
  
  <p>The application fails to start, with the log message:</p>
  
  <pre><code>jekyll 3.3.0 | Error:  No such file or directory @ rb_sysopen - /home/vcap/app/ld_library_path/libreadline.so.5
  </code></pre>