[MacPorts] #72163: eigen3 @3.4.0_1+blas+gcc5+universal: can't read "universal_archs_to_use": no such variable

[MacPorts]

#72163: eigen3 @3.4.0_1+blas+gcc5+universal: can't read "universal_archs_to_use":
no such variable
-------------------------+----------------------
  Reporter:  ar-an-ribe  |      Owner:  eborisch
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.10.5
Resolution:              |   Keywords:
      Port:  eigen3      |
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Comment (by ar-an-ribe):

 Replying to [comment:6 ryandesign]:
 > I am left wondering how the conditional inclusion of the muniversal
 portgroup ever got added to the portfile. I can't see how it ever could
 have worked.

 The currently installed libraries from the `eigen3
 @3.3.8_0+blas+gcc5+universal` port have a last-modified date from October
 2020, so perhaps the conditional inclusion of the muniversal portgroup was
 first added to the `eigen3` portfile after then.

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Ticket URL: <https://trac.macports.org/ticket/72163#comment:7>
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