[MacPorts] #71102: ixion-0.18 @0.18.1: error: no template named 'variant' in namespace 'std'

[MacPorts]

#71102: ixion-0.18 @0.18.1: error: no template named 'variant' in namespace 'std'
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  Reporter:  graywolf-s1  |      Owner:  Tatsh
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.10.2
Resolution:               |   Keywords:
      Port:  ixion-0.18   |
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Comment (by ryandesign):

 [wiki:howto/InstallingOlderPort Downgrading] to autoconf 2.71 works for
 me. I've filed [https://gitlab.com/ixion/ixion/-/issues/64 a bug report
 with the developers of ixion].

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Ticket URL: <https://trac.macports.org/ticket/71102#comment:4>
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