[MacPorts] #57457: Travis CI: Sometimes declared dependencies aren't installed

[MacPorts]

#57457: Travis CI: Sometimes declared dependencies aren't installed
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  Reporter:  ryandesign      |      Owner:  admin@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by ryandesign):

 This problem continues to happen intermittently on Travis.
 [https://github.com/macports/macports-
 ports/pull/4518#issuecomment-498055259 Here's another example].
 [https://paste.macports.org/f8adf4e03b6a The log says]:

 {{{
 --->  Building py27-mistune
 }}}
 {{{
 Traceback (most recent call last):
   File "setup.py", line 4, in <module>
     from setuptools import setup
 ImportError: No module named setuptools
 }}}

 py27-mistune definitely declares a dependency on py27-setuptools.

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Ticket URL: <https://trac.macports.org/ticket/57457#comment:1>
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