pex: Building pex: 4.0ms                    
pex:   Resolving distributions: 0.1ms
Running PEX file at /var/folders/rd/_tjz8zts3g14md1kmf38z6w80000gn/T/tmpR4W2Bg with args ['scripts/do_nothing.py']
pex: PEX.run invoking /Users/wickman/clients/pex/.tox/py27-requests-cachecontrol-coverage/bin/python2.7 /var/folders/rd/_tjz8zts3g14md1kmf38z6w80000gn/T/tmpR4W2Bg scripts/do_nothing.py
  requests 2.7.0x :: Resolving distributions
pex: Building pex: 1135.5ms                 
pex:   Resolving distributions: 1071.8ms
Running PEX file at /var/folders/rd/_tjz8zts3g14md1kmf38z6w80000gn/T/tmpPzN_K8 with args ['scripts/do_nothing.py']
pex: PEX.run invoking /Users/wickman/clients/pex/.tox/py27-requests-cachecontrol-coverage/bin/python2.7 /var/folders/rd/_tjz8zts3g14md1kmf38z6w80000gn/T/tmpPzN_K8 scripts/do_nothing.py
Traceback (most recent call last):tributions :: Packaging pex
  File "/Users/wickman/clients/pex/pex/bin/pex.py", line 530, in <module>
    main()
  File "/Users/wickman/clients/pex/pex/bin/pex.py", line 509, in main
    pex_builder = build_pex(reqs, options, resolver_options_builder)
  File "/Users/wickman/clients/pex/pex/bin/pex.py", line 471, in build_pex
    resolveds = resolver.resolve(resolvables)
  File "pex/resolver.py", line 188, in resolve
    raise self.Error('Ambiguous resolvable: %s' % resolvable)
Error: Ambiguous resolvable: setuptools