[MacPorts] #58819: bison @3.4.1 build failure on 10.4: flex: unknown flag '-'

[MacPorts]

#58819: bison @3.4.1 build failure on 10.4: flex: unknown flag '-'
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  Reporter:  mrkapqa  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.5.4
Resolution:           |   Keywords:  tiger
      Port:  bison    |
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Comment (by SerpentChris):

 I just ran into this issue while installing youtube-dl on a Tiger system.
 It was simple enough to figure out on my own, but would it be possible to
 change the port file to add flex as a dependency on Tiger?

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Ticket URL: <https://trac.macports.org/ticket/58819#comment:3>
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