title: Error while installing sentry `unable to execute 'clang': No such file or directory`
body: <p>I am trying to install sentry by following the instruction from the <a href="https://docs.sentry.io/server/installation/python/" rel="nofollow noreferrer">link</a>: 
  However when I try to execute command <strong>pip install -U sentry</strong>, I receive the error <code>InstallationError: Command python setup.py egg_info failed with error code 1 in /webapps/sentry/env/build/symsynd</code></p>
  
  <p>Here is the detail from log file: </p>
  
  <pre><code> self.run_setup(setup_script, setup_base, args)
        File "/webapps/sentry/env/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1003, in run_setup
          raise DistutilsError("Setup script exited with %s" % (v.args[0],))
      distutils.errors.DistutilsError: Setup script exited with 1
      Complete output from command python setup.py egg_info:
      unable to execute 'clang': No such file or directory
  
  unable to execute 'clang': No such file or directory
  
  
  
      No working compiler found, or bogus compiler options
  
      passed to the compiler from Python's distutils module.
  
      See the error messages above.
  </code></pre>
  
  <p>It would be nice if someone can figure out what am I doing wrong. </p>
  
  <p>Thank you,
  Vady </p>