[MacPorts] #56943: OpenBLAS @0.3.1_0+clang+gcc7+lapack Failed to Build

[MacPorts]

#56943: OpenBLAS @0.3.1_0+clang+gcc7+lapack Failed to Build
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  Reporter:  nhchan     |      Owner:  NicosPavlov
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.3
Resolution:  duplicate  |   Keywords:
      Port:  OpenBLAS   |
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Comment (by nhchan):

 To @michaelld, I had the +llvm40 variant of cctools. I just replicated the
 problem with my other computer with the same +llvm40 variant.

 In both cases, running {{{port install cctools +xcode}}} before attempting
 another port upgrade resolved the issue.

 Thanks for the responses!

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Ticket URL: <https://trac.macports.org/ticket/56943#comment:4>
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