[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
------------------------+-------------------------
  Reporter:  nhchan     |      Owner:  NicosPavlov
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.3
Resolution:  duplicate  |   Keywords:
      Port:  OpenBLAS   |
------------------------+-------------------------

Comment (by mf2k):

 Adding the {{{epoch}}} won't help. Upgrading a port retains current
 variants installed, no matter the defaults. Unless the user uses the
 {{{--enforce-variants}}} flag.

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Ticket URL: <https://trac.macports.org/ticket/56943#comment:3>
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