[MacPorts] #39924: bison @3.0 lib/math.h:27:23: error: #include nested too deeply

[MacPorts]

#39924: bison @3.0 lib/math.h:27:23: error: #include nested too deeply
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  Reporter:  nonstop.server@…  |      Owner:  macports-tickets@…
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:
      Port:  bison             |
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Comment (by egall@…):

 In cases of failures like this, it'd be useful to have a bison2 port to
 fall back on in the meantime: #39910

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Ticket URL: <https://trac.macports.org/ticket/39924#comment:2>
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