title: VerificationError: CompileError: command 'cc' failed with exit status 1
body: <p>I am trying to install: <a href="https://github.com/couchbaselabs/couchbase-python-cffi" rel="nofollow">couchbase-python-cffi</a> as part of a PyPi package. But I keep on getting the following error when trying to install couchbase-python-cffi: </p>
  
  <pre><code>VerificationError: CompileError: command 'cc' failed with exit status 1
  </code></pre>
  
  <p>This error only occurs on my Travis Build: <a href="https://travis-ci.org/ardydedase/pycouchbase/jobs/75819605#L541" rel="nofollow">https://travis-ci.org/ardydedase/pycouchbase/jobs/75819605#L541</a></p>
  
  <p>Here's the content of my travis file: </p>
  
  <pre><code># Config file for automatic testing at travis-ci.org
  
  language: python
  
  python:
    - "3.4"
    - "3.3"
    - "2.7"
    - "2.6"
    - "pypy"
  
  before_install:
    - sudo rm -rf /etc/apt/sources.list.d/*
    - wget -O- http://packages.couchbase.com/ubuntu/couchbase.key | sudo apt-key add -
    - echo deb http://packages.couchbase.com/ubuntu precise precise/main | sudo tee /etc/apt/sources.list.d/couchbase.list
    - sudo apt-get update
    - sudo apt-cache search libcouchbase
    - sudo apt-get install libxml2-dev libxslt-dev python-dev libffi6 libffi-dev
    - sudo apt-get install build-essential libssl-dev
  
  install:
    - sudo apt-get -y install libcouchbase-dev libcouchbase2-core libcouchbase2-libevent libevent-dev
    - pip -q install gevent || echo "Couldn't find gevent"
    - pip -q install twisted
    - pip -q install testresources
    - pip install -r requirements.txt
  
  # command to run tests, e.g. python setup.py test
  script: 
    - cd couchbase-python-cffi
    - python setup.py install
    - cd ..
    - python runtests.py
  </code></pre>
  
  <p>Any help will be greatly appreciated as this has been bothering me for quite a while.</p>