[MacPorts] #60419: bison cannot be built on 10.6 because of a dependency cycle

[MacPorts]

#60419: bison cannot be built on 10.6 because of a dependency cycle
------------------------+--------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  bison
------------------------+--------------------
 https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/25071/steps
 /install-dependencies/logs/stdio

 {{{
 DEBUG: dlist_eval: all entries in dependency list have unsatisfied
 dependencies; can't process
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60419>
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