[MacPorts] #57511: Io: Could NOT find PythonLibs

[MacPorts]

#57511: Io: Could NOT find PythonLibs
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  Reporter:  ryandesign  |      Owner:  markemer
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  Io          |
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Comment (by ryandesign):

 Or using trace mode (the `-t` flag), if it works for you, might have
 caught this.

 Unfortunately Travis didn't catch it because Travis has some ports
 installed even when they're not dependencies. I think that's a bug but I
 don't think we've been able to track down why it's happening.

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Ticket URL: <https://trac.macports.org/ticket/57511#comment:2>
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