[MacPorts] #36450: gmp dependency on flex

[MacPorts]

#36450: gmp dependency on flex
--------------------+------------------------
 Reporter:  snc@…   |      Owner:  mcalhoun@…
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.1.99
 Keywords:          |       Port:  gmp
--------------------+------------------------
 {{{
 …
 checking for bison... bison -y
 checking for flex... flex
 checking lex output file root... configure: error: cannot find output from
 flex; giving up
 …
 }}}

 10.8, there are system-provided bison and flex and MacPorts-installed
 flex.

 Attached config.log.

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Ticket URL: <https://trac.macports.org/ticket/36450>
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