[MacPorts] #64705: libidn fails to build

[MacPorts]

#64705: libidn fails to build
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  Reporter:  metbic  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.7.1
Resolution:          |   Keywords:  yosemite
      Port:  libidn  |
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Comment (by evanmiller):

 This issue looks similar: https://legacy.imagemagick.org/discourse-
 server/viewtopic.php?t=28136

 Apparently there is supposed to be a {{{global_symbol_pipe}}} variable
 that is defined during configure, but that's not happening for some
 reason. This is a good explanation, though it lacks a solution:

 https://lists.gnu.org/archive/html/bug-libtool/2015-07/msg00000.html

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Ticket URL: <https://trac.macports.org/ticket/64705#comment:2>
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