anchor.diff:  
   - Specify a start command in the application manifest by setting the `command` attribute. For more information, see the [Deploying with Application Manifests](../../devguide/deploy-apps/manifest.html#start-commands) topic. 
   
  -## <a id='vendoring'></a>Vendor App Dependencies ##
  +
  +## <a id='vendoring'></a> Vendor App Dependencies
   
   If you are deploying in an environment that is disconnected from the Internet, your application [must vendor its dependencies](https://github.com/cf-buildpacks/buildpack-packager/blob/master/doc/disconnected_environments.md).
   
  
positive.code: Staging failed: Buildpack compilation step failed
  </pre>
  
  ## <a id='start-command'></a>Specify a Start Command ##
  
  The Python buildpack does not generate a [default start command](../../devguide/deploy-apps/start-restart-restage.html#first-time) for your applications.
  
  
negative.code: wordnet
  ```
  
  Having an `nltk.txt` file only causes the buildpack to download the corpora. You still must specify NLTK as a dependency of your app if you want to use it to process the corpora files.
  
  
  ## <a id='proxy_support'></a> Proxy Support
  
  If you need to use a proxy to download dependencies during staging, you can set
  the `http_proxy` and `https_proxy` environment variables. For more information, see the [Proxy Usage Documentation](http://docs.cloudfoundry.org/buildpacks/proxy-usage.html).
  
  
  ## <a id='bosh_trusted_cert'></a> BOSH Configured Custom Trusted Certificate Support
  
  Versions of Python 2.7.9 and later use certificates stored in `/etc/ssl/certs`. Your platform operator can configure the platform to [add the custom certificates into the application container](https://docs.cloudfoundry.org/adminguide/trusted-system-certificates.html).
  
  
  ## <a id='help_support'></a> Help and Support
  
  Join the #buildpacks channel in our [Slack community](http://slack.cloudfoundry.org/) if you need any further assistance.
  
  For more information about using and extending the Python buildpack in Cloud Foundry, see the [python-buildpack GitHub repository](https://github.com/cloudfoundry/python-buildpack).
  
  