[MacPorts] #73276: gn+universal: Fails on El Capitan 10.11.6

[MacPorts]

#73276: gn+universal: Fails on El Capitan 10.11.6
---------------------+-----------------------
  Reporter:  potmj   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  universal
      Port:  gn      |
---------------------+-----------------------
Changes (by PotMJ):

 * Attachment "Portfile" added.

 Legacy and +universal version

-- 
Ticket URL: <https://trac.macports.org/ticket/73276>
MacPorts <https://www.macports.org/>
Ports system for macOS